JP6452220B2 - toothbrush - Google Patents

Description

  The present invention relates to a toothbrush.

Toothbrushes are widely used to clean the oral cavity. By the way, since the clearance gap shape and tooth shape in an oral cavity are various, the shape of the cleaning surface formed by connecting the front-end | tip of all the hair may be adjusted according to each site | part in an oral cavity.
For example, in order to improve the cleanability of the interdental part, it is effective to make the cleaning surface a so-called mountain-cut undulation shape with a sharp convex part at the top so that the bristles reach a narrow gap. is there.
In order to improve the cleaning performance of the tooth neck, a so-called dome shape having an obtuse convex portion at the top is effective for the cleaning surface.
In order to improve the cleaning performance of the occlusal surface such as the back teeth, it is effective to increase the contact area with the occlusal surface and make the cleaning surface substantially flat so as to withstand a high brushing pressure.
As described above, the form of the preferred cleaning surface varies depending on the site in the oral cavity. Therefore, in order to improve the cleaning performance for a plurality of sites in the oral cavity, the toothbrushing surface of the toothbrush can be divided into a plurality of regions, and the cleaning surfaces in each region can have different forms and have a plurality of cleaning functions. (Patent Document 1).
However, since the size of the flocked surface is limited to some extent, the toothbrush described in Patent Document 1 cannot sufficiently secure the area of each region where the shape of the cleaning surface is different, and the cleaning function on each cleaning surface is sufficient. It was not demonstrated to. And it was difficult to operate a toothbrush in order to use the cleaning function in the form of each cleaning surface properly.
Patent Document 2 discloses a toothbrush in which a plurality of bristles having different bristle lengths are mixed over the entire flocked region. However, this toothbrush is intended to achieve both a good fit and a soft contact feeling, and does not sufficiently exhibit a plurality of cleaning functions.

JP 2012-245314 A JP 2013-336 A

  The present invention provides a toothbrush that has a plurality of cleaning functions suitable for each of a plurality of sites in the oral cavity, can easily use each cleaning function, and can sufficiently exhibit each cleaning function. The purpose is to do.

The present invention includes the following aspects.
[1] A toothbrush comprising a brush portion in which a plurality of hair bundles are implanted on the flocked surface,
The brush part has a plurality of step-like hair bundles composed of a first hair bundle part made of hair having an arbitrary height and a second hair bundle part lower than the height of the first hair bundle part,
The second cleaning surface formed by connecting the tips of all the second hair bundle portions is an undulating shape that undulates in at least one of the length direction and the width direction of the flocked surface,
The 1st cleaning surface formed by connecting the front-end | tip of all the 1st hair bundle parts is made into the undulation shape which is not similar to the said 2nd cleaning surface, or a surface parallel to the said flocked surface. ,toothbrush.
[2] The stepped hair bundle is implanted by inserting a flat wire sandwiched between the two folded hair bundles into a flock hole formed in the flocked surface, and the first hair bundle portion and the The toothbrush according to [1], wherein the second hair bundle portion is formed across a flat line.
[3] The toothbrush according to [1] or [2], wherein the undulating shape of the second cleaning surface is a shape having irregularities in the length direction of the flocked surface.

  The toothbrush of the present invention has a plurality of cleaning functions suitable for each of a plurality of parts in the oral cavity, can easily use each cleaning function properly, and can sufficiently exhibit each cleaning function.

It is a side view which shows one Embodiment of the toothbrush of this invention. It is a schematic diagram which shows an example of the 1st hair | bristle bundle part and 2nd hair | bristle bundle part in flat line type | formula flocking. It is a figure explaining an example of a cleaning surface, Comprising: It is a side view when the side surface in alignment with the width direction of a head part is seen. It is a figure explaining an example of a cleaning surface, Comprising: It is a side view when the side surface in alignment with the length direction of a head part is seen. It is a figure explaining an example of a cleaning surface, Comprising: It is a side view when the side surface in alignment with the width direction of a head part is seen. It is a side view which shows typically an example of the 1st cleaning surface and the 2nd cleaning surface, and is a side view when seeing the side along a length direction of a head part. It is a schematic diagram which shows an example from which the shape of the hair of a 1st hair bundle part differs from the shape of the hair of a 2nd hair bundle part. It is a top view which shows typically an example of the arrangement | positioning of the flat line in flat line type | formula flocking. It is a figure explaining the cleaning surface in Example 1, Comprising: It is a side view when the side surface in alignment with the width direction of a head part is seen. It is a figure explaining the cleaning surface in the comparative example 3, Comprising: It is a side view when the side surface in alignment with the width direction of a head part is seen.

An embodiment of the toothbrush of the present invention will be described.
In FIG. 1, the side view of the toothbrush of this embodiment is shown. The toothbrush 1 of the present embodiment is obtained by integrally forming a handle body 10 and a head portion 20 extending from the handle body 10. One surface of the head portion 20 is a flocked surface 20a, and a brush portion 30 in which a plurality of hair bundles are implanted is formed on the flocked surface 20a.
The brush part 30 has a plurality of step-like hair bundles, each of which includes a first hair bundle part 31 made of hair having an arbitrary height and a second hair bundle part 32 lower than the height of the first hair bundle part 31. Yes.
The first hair bundle portion 31 is a bundle of a plurality of hairs 31c made of hair having an arbitrary height, and the second hair bundle portion 32 is a plurality of hairs 32c shorter than the hair 31c. Are bundled.

The head portion 20 in the present embodiment has a substantially rectangular flat plate shape in which the length direction of the handle body 10 is a long side, and the corner portion is cut off with a curve in plan view.
A plurality of flock holes are formed on the flocked surface 20a, and hair bundles are planted in the flock holes.

The size of the head portion 20 can be determined in consideration of the operability in the oral cavity.
If the length of the head portion 20 in the width direction is too long, the operability in the oral cavity is lowered, and if it is too short, the number of hair bundles to be implanted becomes too small, and the cleaning effect tends to be impaired. Therefore, the length in the width direction of the head unit 20 is, for example, 5 to 13 mm.
As the thickness of the head portion 20 is thinner, the operability in the oral cavity can be improved. However, if the thickness is too thin, the strength of the head portion 20 tends to be insufficient. Therefore, the thickness of the head portion 20 can be determined in consideration of the material of the handle body 10 and the like, for example, 1.5 to 5 mm is preferable, and 2 to 3 mm is more preferable.
If the length of the head part 20 in the length direction is too long, the operability in the oral cavity tends to be impaired, and if it is too short, the number of hair bundles to be implanted becomes too small, and the cleaning effect tends to be impaired. Therefore, the length of the head portion 20 in the length direction is appropriately determined in the range of 10 to 26 mm.

The shape of the flocked hole is not particularly limited, and examples thereof include a circle such as a perfect circle or an ellipse, and a polygon such as a triangle or a rectangle. Usually, it is a perfect circle, but by making it a quadrangle (rectangle, square), the undulation of the cleaning surface described later can be made smoother.
The number of flock holes is not particularly limited, and is, for example, 10 to 60 holes.
The diameter of the flock hole is determined according to the desired thickness of the hair bundle, and is, for example, 1 to 3 mm.
The arrangement pattern of the flock holes is not particularly limited, and may be any arrangement pattern such as a so-called grid pattern or staggered pattern.

In the present embodiment, the hair bundle is folded in half, a flat wire is sandwiched between the folded hair bundles, and the flat wire is driven into the flocked hole, whereby the hair bundle is implanted on the flocked surface 20a. One of the hair bundles folded in half when the flat line 40 is used as the boundary is the first hair bundle portion 31, and the other hair bundle in the folded state is the second hair bundle when the flat line 40 is used as the boundary. This is part 32 (FIG. 2). That is, the first hair bundle portion 31 and the second hair bundle portion 32 are formed with the flat wire 40 interposed therebetween.
Furthermore, in this embodiment, the 2nd cleaning surface formed by connecting the front-end | tip of all the 2nd hair | bristle bundle parts 32 is made into the undulating shape which undulated in at least one of the length direction of the flocked surface 20a, and the width direction. ing. The 1st cleaning surface formed by connecting the front-end | tip of all the 1st hair bundle parts 31 is made into the undulation shape which is not similar to the said 2nd cleaning surface, or a surface parallel to the said flocked surface. Yes.
That is, in the toothbrush 1 of this embodiment, it is formed by connecting the 1st cleaning surface formed by connecting the front-end | tip of all the 1st hair | bristle bundle parts 31, and the front-end | tip of all the 2nd bristles 32. And a second cleaning surface. The portion where both the first cleaning surface and the second cleaning surface are formed is preferably 80% or more, and 90% or more of the entire brush portion 30 because the effect of the present invention is more exhibited. Is more preferable, and 100% is particularly preferable.

As described above, the first cleaning surface is not particularly limited as long as it is an undulating shape that is not similar to the second cleaning surface, or a surface that is parallel to the flocked surface, and has various shapes. can do. The second cleaning surface is not particularly limited as long as the second cleaning surface is undulated in at least one of the length direction and the width direction of the flocked surface, and can have various shapes.
For example, the following cleaning surfaces can be applied to the first cleaning surface or the second cleaning surface.
The example shown in FIG. 3 is a convex shape formed by making the height of the central hairs 31c, 32c the highest in the width direction of the flocked surface 20a and decreasing the height of the hairs 31c, 32c toward both ends. a cleaning surface of the undulating shape P _a of. In such a cleaning surface, the contact with the tooth neck and the cleaning performance of the tooth neck are improved, but the cleaning performance of the occlusal surfaces such as the interdental portion and the back teeth is lowered.
The example shown in FIG. 4 is a cleaning surface of an uneven undulated shape P _B formed by alternately arranging long hair bundles (hair bundle portions 32a) and short hair bundles (hair bundle portions 32b). In such a cleaning surface, the interdental cleaning property is enhanced, but the tooth neck portion cannot be uniformly contacted, and the contact feeling to the tooth neck portion and the cleaning property of the tooth neck portion are lowered.
Example shown in FIG. 5, the height of the bristle bundle (first tuft 31 or second tuft 32) in the same and parallel to the flat shape P _C the cleaning surface against flocking surface 20a It is an example. Such a cleaning surface is suitable for cleaning occlusal surfaces such as the back teeth, but is not suitable for cleaning interdental and cervical parts.

The brush part 30 in this invention is obtained by combining the above cleaning surfaces and forming a 1st cleaning surface and a 2nd cleaning surface.
For example, the brush part 30 as shown in FIG. 6 can be obtained by using the cleaning surface shown in FIG. 3 as the first cleaning surface and the cleaning surface shown in FIG. 4 as the second cleaning surface. Example 1 to be described later is a specific example having the brush part 30 shown in FIG. That is, in Embodiment 1, the first cleaning surface P _1, in the width direction of the bristle surface 20a central highest, there is a cleaning surface convex topography to be lower toward the end portion. The second cleaning surface P _2, by the second bristle bundle portion and Hair length higher hair length along the length of the flocked surface 20a and a lower second hair bundle part are alternately arranged, the uneven It is considered as a cleaning surface.

  The difference between the height (hair length) of the first hair bundle portion 31 and the height (hair height) of the second hair bundle portion 32 is preferably more than 0 mm and not more than 7 mm, and more preferably 1 to 5 mm. If the difference between the length of the first hair bundle portion 31 and the length of the second hair bundle portion 32 is equal to or greater than the lower limit value, the toothbrush 1 can be easily provided with a plurality of cleaning functions. If so, a plurality of cleaning functions can be used more easily.

The hairs 31c, 32c are, for example, hairs that are tapered toward the hair tips, the hair tips are sharpened (taper hairs), hairs that have the same diameter throughout the length direction (straight hairs), hair tips Hairs branched into a plurality of ends (branched ends of the hair ends) and the like. Examples of the straight hair include those having a hair tip which is a plane substantially parallel to the flocked surface 20a and those having a hair tip rounded into a hemisphere.
In this embodiment, since the hair loss can be suppressed even if the hair bundle is composed of the first hair bundle portion 31 and the second hair bundle portion 32 having different lengths, it is preferable to use a branched end hair.
The hair 31c for the first hair bundle portion 31 and the hair 32c for the second hair bundle portion 32 may be the same or different. In a case where the cleaning function by the second cleaning surface is more exhibited, it is preferable that the hair 31c of the first hair bundle portion 31 has lower rigidity than the hair 32c of the second hair bundle portion 32. Specifically, a mode in which the bristles 31c are bristles and the bristles 32c are straight hairs (FIG. 7), a mode in which the bristles 31c are tapered hairs and a bristles 32c are straight hairs are preferred.

The material of the hair 31c, 32c is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate (PTT), polyethylene naphthalate ( PEN), polyesters such as polybutylene naphthalate (PBN), polyolefins such as PP, elastomer resins such as olefin elastomers and styrene elastomers. These resin materials can be used singly or in combination of two or more.
Moreover, as the hair 31c and 32c, the polyester hair which has the multi-core structure which has a core part and the sheath part of at least 1 layer or more provided in the outer side of this core part is mentioned.

  The cross-sectional shape of the bristles 31c and 32c is not particularly limited, and may be a circle such as a true circle or an ellipse, a polygon, a star, a three-leaf clover, a four-leaf clover, or the like. The cross-sectional shapes of all the hairs 31c, 32c may be the same or different.

The height of the hair 31c and 32c is determined according to the form of each cleaning surface, and is, for example, in the range of 6 to 13 mm.
The thickness of the hair 31c, 32c can be determined in consideration of the material and the like, and when the cross section is circular, for example, 6 to 9 mil (1 mil = 1/1000 inch = 0.025 mm). Further, in consideration of a feeling of use, a feeling of brushing, a cleaning effect, durability, and the like, a plurality of hairs 31c and 32c having different thicknesses may be used in any combination.

The flat wire 40 used in this embodiment passes through the center of the flocked hole and is placed in the flocked hole so as to straddle the flocked hole. Examples of the material of the flat wire 40 include metals such as brass and stainless steel, as well as hard plastics and biodegradable plastics.
The angle of the flat line 40 can be arbitrarily changed according to the purpose of use of the toothbrush, and the feeling of hair loss can be suppressed by adjusting the angle of the flat line 40. For example, in order to improve the fit to the gums for cleaning the neck and neck, it is preferably ± 80 °, more preferably ± 85 ° with respect to the length direction of the flocked surface 20a, 90 It is particularly preferable that the angle is. Further, the angle of the flat line 40 can be adjusted at any angle with respect to the flocked surface 20a so that the step formation between the hair bundle portion 31 and the hair bundle portion 32 can be adjusted.
The length, width, and thickness of the flat wire 40 may be arbitrarily adjusted according to the first hair bundle portion 31 and the second hair bundle portion 32 and the flocked hole. Usually, the length of the flat wire 40 is the length of the flocked hole. It is larger than the diameter, and the width of the flat wire 40 is made smaller than the depth of the flock hole. Moreover, by adjusting the thickness of the flat wire 40, the first hair bundle portion 31 and the second hair bundle portion 32 can be reliably fixed in the flocked hole to reduce the gap. Further, in order to prevent the flat wire 40 from coming out of the flocked hole, the total length of the portions protruding from both sides of the flocked hole is preferably 0.3 to 0.6 mm.

The material of the handle body 10 and the head portion 20 can be determined in consideration of the rigidity and mechanical characteristics required for the handle body 10 and the head portion 20, for example, a resin having a flexural modulus (JIS K7203) of 500 MPa or more (hereinafter referred to as a hard resin). And a resin having a flexural modulus of 2000 MPa or more is more preferable. Although the upper limit of the bending elastic modulus of resin used for the handle body 10 and the head part 20 is not particularly limited, it is set to, for example, 3000 MPa.
Examples of the resin having a flexural modulus of 500 MPa or more include polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT), polyacetal (POM), and polyethylene naphthalate (PEN). ), Polystyrene (PS), acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), etc. POM, PEN, PBT, PCT and the like are preferable. By using a resin having a flexural modulus of 2000 MPa or more, the head portion 20 can be thinned, the operability in the oral cavity can be improved, and the handle body 10 can be prevented from being damaged.

Moreover, the handle body 10 may be partially or entirely covered with a soft resin. Since part or all of the handle body 10 is covered with the soft resin, the fit of the hand when the user grips the handle body 10 is improved, and the gripped fingers can be prevented from slipping.
As the soft resin, for example, a resin having a Shore hardness of A90 or less is preferable, and a resin having a Shore hardness of A10 to 40 is more preferable. Examples of such soft resins include elastomer resins such as polyolefin-based elastomers, styrene-based elastomers, polyester-based elastomers, polyurethane-based thermoplastic elastomers, and silicon.

The brush portion 30 of the toothbrush 1 includes a first cleaning surface P ₁ and the second cleaning surface P ₂ is formed, the first cleaning surface P ₁ is not the undulating shape similar to the shape of the second cleaning surface P _s Since it is shape or flat, it has a plurality of cleaning functions suitable for each of a plurality of sites in the oral cavity. The step-like tufts to form the first cleaning surface P ₁ and the second cleaning surface P ₂ are sparse hair feeling by comprising a first tufts 31 and second tufts section 32. can be suppressed, moreover since the portion to form a first cleaning surface P ₁ and the second cleaning surface P ₂ is large, it is possible to sufficiently exhibit the cleaning function of the cleaning surface.
Further, the toothbrush 1 may be selectively used and only by changing the brushing pressure for pressing the hair bundle to the teeth cleaning by the cleaning and the second cleaning surface P ₂ of the first cleaning surface P _1. That is, when weak brushing pressure cleaning according to the first cleaning surface P ₁ is mainly, when strong brushing pressure cleaning according to the second cleaning surface P ₂ is the main processor. Therefore, a plurality of cleaning functions can be used properly.

  In addition, this invention is not limited to the said embodiment, If a 1st hair bundle part and a 2nd hair bundle part are formed in a hair bundle and a 1st cleaning surface and a 2nd cleaning surface can be formed, a flat line will be provided. It does not have to be the flocking used.

Example 1
Polypropylene was injection molded to obtain an integrally molded product having a handle body and a head portion.
Next, a hair bundle in which a plurality of bristles having one end portion side bristles (3 mils, 8 branches) and the other end side straight hairs (8 mils) are bundled is folded in two. A flat wire was inserted between the folded hair bundles. Next, as shown in FIG. 8, a hair bundle was implanted by driving a flat wire into a flock hole so that the flat wire angle was 90 ° with respect to the length direction of the flocked surface 20a. At this time, one side having the flat wire 40 as a boundary was the first hair bundle portion 31 made of branched hairs, and the other side having the flat wire 40 was made the second hair bundle portion 32 made of straight hair. Moreover, the height of the hair of the 2nd hair | bristle bundle part 32a in the odd-numbered row | line | column of FIG. 8 was 8 mm, and the hair height of the 2nd hair | bristle bundle part 32b in the even-numbered row | line | column was 10 mm. Thus, the second cleaning surface P ₂ formed by contiguous with the distal end of all the second hair bundle of the hair bundle of the hair bundle part 32a and the height 8mm height 10mm in the longitudinal direction of the bristle surface 20a It was set as the uneven | corrugated shaped surface (FIG.6 and FIG.9) in which the part 32b is repeatedly arrange | positioned.
Then, the first cleaning surface P ₁ formed by contiguous with the distal end of all first bristle bundle of, turned in the width direction of the bristle surface 20a center highest height 12 mm, lower toward the end portion Then, the hair of the first hair bundle part was ground so as to be a surface (FIG. 9) on which a convex part having a height of 10 mm was formed.
This gave toothbrush both first cleaning surface P ₁ and the second cleaning surface P ₂ is formed.

(Example 2)
The toothbrush is the same as in Example 1 except that the bristle forming the second cleaning surface is changed to a bristle tip branch hair (branch portion 3 mil, 8 pieces, root portion 8 mil).

Example 3
The toothbrush is the same as that of Example 1 except that the hair for forming the first cleaning surface is changed to straight hair (8 mil).

(Example 4)
The toothbrush is the same as in Example 1 except that the flat line angle is 15 ° with respect to the length direction of the flocked surface 20a.

(Comparative Example 1)
It is a toothbrush of the single cleaning surface which does not have a 2nd cleaning surface only in the 1st cleaning surface in Example 1. FIG.

(Comparative Example 2)
It is a toothbrush of the single cleaning surface which does not have a 1st cleaning surface only in the 2nd cleaning surface in Example 1. FIG.

(Comparative Example 3)
The 1st cleaning surface in Example 1 is the uneven | corrugated shape (FIG. 4) by which the long hair | bristle bundle part 31 and the short hair | bristle bundle part 32 are repeatedly arrange | positioned in the length direction of the flocked surface 20a, and is centered in the width direction of the flocked surface 20a. Is the shape in which the convex part which becomes the highest and becomes lower toward the end part is formed. Specifically, the cleaning surface formed by connecting the tips of the first hair bundle portions 31 in the odd-numbered rows in FIG. 8 is the highest in the width direction of the flocked surface 20a at the height of 10 mm and toward the end portion. A shape P _F (FIG. 10) in which a convex portion having a lower end and a height of 8 mm is formed. The cleaning surface formed by connecting the tips of the first hair bundle portions 31 in the even-numbered row in FIG. 8 is the highest in the center in the width direction of the flocked surface 20a at a height of 12 mm, and is lowered toward the end portion. A shape P _E (FIG. 10) in which a convex portion having a height of 10 mm is formed. The hair used to form the first cleaning surface was branched at the tip of the hair (8 mils, 8 branches).
In this example, only the first cleaning surface is provided and the second cleaning surface is not provided.
Otherwise, the toothbrush is the same as in Example 1.

(Comparative Example 4)
The toothbrush is the same as in Example 1 except that the height of the bristles forming the second cleaning surface is constant at 10 mm, and the second cleaning surface is a flat shape parallel to the flocked surface.

<Evaluation>
Ten monitors evaluated the use feeling of the toothbrush as follows. The evaluation results are shown in Tables 1 and 2.
[Rubber comfort]
Each monitor cleaned the inside of the oral cavity with the toothbrush of each case, and the contact feeling at that time was evaluated according to the following criteria.
5 points: Very good contact with gums, 4 points: Very good contact with gums, 3 points: Good contact with gums, 2 points: Not very comfortable with gums, 1 point : Not comfortable against gums.
Then, the average score of 10 monitors is obtained, the average score is 4.5 or more ◎ +, the average score is 4.0 or more and less than 4.5, the average score is 3.0 or more and less than 4.0, the average score Was 2.0 or more and less than 3.0, and Δ was an average score of less than 2.0.

[Gum cleaning feeling]
Each monitor cleaned the inside of the oral cavity with the toothbrush of each case, and the actual cleaning feeling of the gums at that time was evaluated according to the following criteria.
5 points: Gum stains are well removed, 4 points: Gum stains are well removed, 3 points: Gum stains are well removed, 2 points: Gum is clean There is not much feeling that the dirt is removed well, 1 point: There is no feeling that the dirt on the gums is removed well.
Then, the average score of 10 monitors is obtained, the average score is 4.5 or more ◎ +, the average score is 4.0 or more and less than 4.5, the average score is 3.0 or more and less than 4.0, the average score Was 2.0 or more and less than 3.0, and Δ was an average score of less than 2.0.

[Actual cleaning between teeth]
Each monitor cleaned the inside of the oral cavity with the toothbrush of each case, and the actual cleaning feeling between the teeth was evaluated according to the following criteria.
5 points: The feeling that dirt between teeth was well removed was quite strong, 4 points: The feeling that dirt between teeth was well removed was strong, 3 points: The feeling that dirt between teeth was well removed was 2 points : There is not a real feeling that dirt between teeth is well removed, 1 point: There is no feeling that dirt between teeth is well removed.
Then, the average score of 10 monitors is obtained, the average score is 4.5 or more ◎ +, the average score is 4.0 or more and less than 4.5, the average score is 3.0 or more and less than 4.0, the average score Was 2.0 or more and less than 3.0, and Δ was an average score of less than 2.0.

In each of the toothbrushes of Examples 1 to 4, the touching feeling on the gums, the gum cleaning feeling, and the cleaning feeling between the teeth were all excellent.
In contrast to the above example, in the toothbrush of Comparative Example 1, the cleaning feeling between the teeth was low.
In the toothbrush of the comparative example 2, the contact feeling to a gum and the feeling of cleaning of a gum were low.
In the toothbrush of the comparative example 3, the contact feeling to a gum, the cleaning feeling of a gum, and the cleaning feeling between teeth were low.
In the toothbrush of the comparative example 4, the cleaning feeling between teeth was low.
That is, the toothbrushes of Comparative Examples 1 to 4 did not have a plurality of cleaning functions suitable for each of the gums and between the teeth.

DESCRIPTION OF SYMBOLS 1 Toothbrush 10 Handle body 20 Head part 20a Flocking surface 30 Brush part 31 First hair bundle part 31c Hair 32, 32a, 32b Second hair bundle part 32c Hair 40 Flat line

Claims (5)

A toothbrush comprising a brush portion in which a plurality of hair bundles are implanted on a planar flocked surface,
The brush part has a plurality of step-like hair bundles composed of a first hair bundle part made of hair having an arbitrary height and a second hair bundle part lower than the height of the first hair bundle part,
The stepped hair bundle is planted by inserting a flat wire sandwiched between two folded hair bundles into a flock hole formed on the flocked surface,
For each flock hole, the first hair bundle portion and the second hair bundle portion are formed across the flat wire,
The second cleaning surface formed by connecting the tips of all the second hair bundle portions is an undulating shape that undulates in at least one of the length direction and the width direction of the flocked surface,
The 1st cleaning surface formed by connecting the front-end | tip of all the 1st hair | bristle bundle parts is the undulating shape which is not similar to the said 2nd cleaning surface , and adjoins which has a height difference in a 1st hair | bristle bundle part. In the step-like hair bundles, the total length of the hair length of the first hair bundle portion and the hair length of the second hair bundle portion is different ,
Alternatively, a toothbrush in which the first cleaning surface is a surface parallel to the flocked surface .   The toothbrush according to claim 1, wherein the undulating shape of the second cleaning surface is a shape having irregularities in the length direction of the flocked surface. The toothbrush according to claim 1 or 2, wherein both the first cleaning surface and the second cleaning surface are formed in an area of 80% or more of the entire brush portion. The toothbrush according to any one of claims 1 to 3, wherein the first cleaning surface is formed by grinding a first hair bundle portion. The toothbrush as described in any one of Claims 1-4 whose rigidity of the bristle which comprises the said 1st bristle bundle part is lower than the rigidity of the bristle which comprises the said 2nd bristle bundle part.

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