JP2000000117A - Tooth brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tooth brush which is excellent both in holding capacity and brushing performance of a tooth brushing agent. SOLUTION: Tufts 4 of bristles with the density thereof exceeding 64% are used and arranged in plurality on the surrounding area of the center point O to form grouped block patterns around the center point by a plurality of groups of the bristle tufts. The ratio (bristle tuft occupying rate) of the sum of the sectional areas of all bristle tufts is 35% or more per a block area obtained by aligning the outsides of the groups of bristle tufts. The ratio (block- wise bristle density) of the sum of sectional areas of brushing bristles is 22% or more per the block area obtained by aligning the outsides of the groups of bristle tufts. The ratio of the block area in one block pattern is at least 4% or more per bristle covered are obtained by aligning the outsides of the bristle bundles in the whole of the bristle planted area. When the block patterns are formed in plurality, the ratio of the sum of the block areas in the plurality of block patterns is set at least 10% per the total bristle-planted area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush which is excellent in both the holding power of a dentifrice and the brushing property of a tooth, especially the polishing property.

[0002]

2. Description of the Related Art Usually, a toothbrush has a diameter of 1.5 to 2.0.
A flocked hole having a circular cross section of about 0 mm was formed on the flocked surface of the head part.
They are regularly arranged like a grid at intervals of 5 to 1.2 mm, and a plurality of (for example, 15 to 30)
The hair bundle obtained by bundling the brushes (filaments) of the book) was implanted by folding it into two pieces with a flat line and driving the hair bundle. The denseness of the planted hair bundle was usually about 55 to 60%. The hair bundle density refers to the ratio of the cross-sectional area of the flocking hole to the sum of the cross-sectional areas of the brushes constituting the hair bundle.

[0003] In the above-mentioned conventional brush, in order to prevent the occurrence of cracks or breakage due to the impact at the time of striking a flat wire, the spacing between the flocking holes cannot be narrowed and the flocking density of the whole flocking surface cannot be increased so much. Regarding the hair bundle density, loss of the integral of the cross section of the flat wire for driving the hair bundle always occurs. For these reasons, there is a limit in increasing the density of the bristle bundle, and the holding power of the dentifrice during brushing cannot be sufficiently increased.

[0004] In addition, the ratio of the cross-sectional area of the bristle bundle to the total area of the bristle bundle in the head portion is generally about 19 to 36% in the conventional toothbrush. Some of them have been further reduced to about 10 to 18% (see Japanese Utility Model Application Laid-Open No. 63-191928), but it has been difficult to simultaneously satisfy both the holding power of the dentifrice and the brushability of the teeth.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a toothbrush which is excellent in both the holding power of a dentifrice and the brush-cleaning property of a tooth, particularly, a polishing property. The purpose is to provide.

[0006]

In order to achieve the above object, a toothbrush according to the first aspect of the present invention has a bristle bundle density of 6.
A hair bundle of 4% or more is used, a plurality of hair bundles having a hair density of 64% or more are arranged around a center point, and a group of the hair bundles is used to form a block around the center point. A pattern is formed, the block includes at least one block pattern constituted by the plurality of hair bundle groups, and the block corresponds to a block area obtained by connecting a hair bundle outside of the hair bundle group forming the block pattern with a straight line. The configuration is such that the ratio of the sum of the cross-sectional areas of all the hair bundles constituting the pattern (hair bundle occupancy) is 35% or more.

A toothbrush according to a second aspect of the present invention uses a bristle bundle having a bristle density of 64% or more, and a plurality of bristle bundles having a bristle density of 64% or more around a central point. Placed,
A group of block patterns is formed around the center point by the plurality of hair bundle groups, and at least one block pattern constituted by the plurality of hair bundle groups is formed.
And the ratio of the sum of the cross-sectional areas of the brushes of all the hair bundles constituting the block pattern to the block area obtained by connecting the outside of the hair bundle of the hair bundle group forming the block pattern with a straight line (the density of the block hairs) ) Is 22% or more.

[0008] In the toothbrush, the outside of the bristle bundle on the entire flocked surface is connected by a straight line to the flocked area obtained by 1
More preferably, the ratio of the block area of one block pattern is at least 4% or more. Further, when a plurality of block patterns are formed, the ratio of the sum of the block areas of the plurality of block patterns to the flocking area obtained by connecting the outside of the tuft of the entire flocking surface with a straight line is 10% or more. Is preferred.

[0009]

A plurality of hair bundles having a hair density of 64% or more are arranged around a central point, and a group of these bundles forms a block pattern around the central point. The ratio (hair bundle occupancy) of the sum of the cross-sectional areas of all the hair bundles constituting the block pattern to the block area obtained by connecting the hair bundle outside of the hair bundle group forming the pattern with a straight line is 35% or more, or The ratio of the sum of the cross-sectional areas of the brushes of all the hair bundles constituting the block pattern to the block area obtained by connecting the outside of the hair bundle of the hair bundle group forming the block pattern with a straight line (block density) is 22%. As described above, the dentifrice is easily held in the bristle bundle at the time of brushing the teeth, and since the flock density per unit area is high, the brushing of the teeth, especially the polishing is efficiently performed, and It can be carried out in the results basis.

Further, the ratio of the block area of one block pattern to the flocking area obtained by connecting the outside of the hair bundle of the whole flocking surface with a straight line is at least 4% or more, or when a plurality of block patterns are formed. In the case where the ratio of the sum of the block areas of the plurality of block patterns to the flocking area obtained by connecting the outside of the hair bundle of the entire flocking surface with a straight line is 10% or more, the holding power of the dentifrice is further increased. And the polishing properties of the teeth can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a toothbrush according to the present invention. FIG. 1 is a plan view of the head portion, and FIG. 2 is a cross-sectional view taken along line AA in FIG. In the figure, 1 is a toothbrush head, 2 is a flocked surface, 3 is a buried hole, 4 is a bristle bundle, 5 is a single bristle (filament) constituting the bristle bundle 4, and 6 is a bristle bundle tip. Reference numeral 7 denotes an independent hair bundle which does not constitute a block pattern described later.

In the first embodiment, a hair bundle having a dense hair density of 64% or more is used as the hair bundle 4, and the cross-sectional shapes of the hair bundles 4 having a dense hair density of 64% or more are all the same. A set of six hair bundles 4 having the same cross-sectional shape is planted around the center point O as a set, and a group of these six hair bundles forms a block pattern of a petal-like unit around the center point O. In the case of the example shown in FIG.
In this example, two sets of petal-like block patterns each composed of a set of hair bundles are arranged in the longitudinal direction of the brush. Note that tuft density, the cross-sectional area S ₁ of the buried hole 3,
The ratio of the sum [sigma] s ₂ of the sectional area S ₂ of each brush 5 constituting the tufts 4 to be planted in the embedding hole 3, i.e., [sigma] s
It is given by ₂ / _{S 1.}

Although it is sufficient that the hair bundle density of the hair bundle 4 is 64% or more, the process of adjusting the shape of the hair bundle and the tip of the hair in the production line, and finally the toothbrush is extracted from the mold In consideration of the removal step and the like, it is desirable that the hair bundle density of the hair bundle 4 is 85% at the maximum, more preferably 80%. Thus, the hair bundle density of the hair bundle 4 is 64
When it is in the range of 85%, the balance between manufacturing efficiency and quality performance can be further improved. In order to increase the density of the bristle bundles of the bristle bundle 4, not only increase the number of brushes constituting the bristle bundle 4, but also change the cross-sectional shape of each brush to a shape other than a circle such as a square, a triangle, or a hexagon. It can also be realized by forming a cross section.

If the number of brushes constituting the bristle bundle 4 is increased and packed to the limit, the denseness of the bristle bundle can be increased to 100% or more. However, although the probability of contact of the bristle tip with the tooth surface increases as the bristle bundle density increases, the gap between the brushes constituting the bristle bundle 4 decreases when the bristle bundle density becomes too high. Cause a decrease in the holding power of the agent,
The tip of the hair bundle 4 is opened in a broom-like manner toward the tip, and the brushing performance cannot be sufficiently improved.
It is also undesirable from an aesthetic point of view. As a result of various experiments by the present inventors, the hair bundle density of the hair bundle 4 was 64 as described above.
The range of ~ 85% was optimal.

Hair bundle 4 forming one block pattern
If the size of the block obtained by connecting the outermost circumference of the bristle bundle with a virtual line is too small, a sufficient holding effect of the dentifrice is not obtained, and if it is too large, the operability of the toothbrush in the oral cavity is reduced. It gets worse. Multiplying the crown height of the permanent teeth and the length in the dentition direction to determine the lateral area for convenience with reference to Kotaro Fujita's “Tooth Anatomy” (Kanehara Publishing), etc. in 100.6mm ^2, the minimum is 49.1Mm ² mandibular central incisors. The size of the whole block is
It is desirable to have a size that just fits one tooth from the viewpoint of brushability and operability. Considering the case where there are a plurality of blocks, considering the area per block, 10
100 mm ² approximately, about φ3.5~φ11.3mm is preferred if expressed by the diameter of the assumed circle this area.

Hair bundle 4 forming one block pattern
The ratio of the sum [sigma] s ₄ of the cross-sectional area S ₄ of the tufts 4 constituting the block pattern to the area S ₃ of the block 8 obtained by connecting tufts outer group by a straight line (hair bundle occupancy) = [sigma] s ₄ If / S ₃ is too small, the polishing effect of the group of blocked hair bundles will not be exhibited, and if it is too large, the flexibility of the entire block will tend to decrease. Therefore, at least 35% or more and 100% or less. It is better to be less than 40% and more preferably less than 80%.

Further, the sum of the cross-sectional areas S ₂ brush 5 constituting the block pattern to the area S ₃ of the block 8 obtained by connecting tufts outer tufts group forming the one block pattern in a straight line ΣS The ratio to ₂ (density of block hair) = ２S ₂ / S ₃ is at least 22% or more and 100% or less, more preferably 27% or more and 80% or less for the same reason as the above-mentioned hair bundle occupancy. It is good to do.

The area S ₃ of the block 8, poor polishing efficiency is too small, since it requires some more size is, for at least one one block 8, flocking area flocked surface 2 S ₅ 4% or more and 95% or less, more preferably 10% or more and 95% or less with respect to (shown by a dotted line in FIG. 1). Furthermore, if there is a plurality of blocks on the flocked surface 2, the block area S ₃ of the sum [sigma] s ₃ is 10% or more of the flocked area S ₅ of the bristle surface 2, 95% or less, more preferably,
It is good to be 15% or more and 95% or less.

The number of brushes of the whole hair bundle group forming one block pattern is 44 to 17 depending on the brush diameter.
The number is about 550. More specifically, brush diameter 3-5mi
l (0.76 to 0.127 mm), about 175 to 17550, 6 to 8 mil (0.125 to 0.15 mm).
203 mm), 69 to 4400, 9
In the case of about 10 to 10 mils (0.229 to 0.254 mm), by setting the number to about 44 to 2,000, many brush tips can be brought into concentrated contact with the tooth surface.

The overall shape of the surface 6 constituted by the tip of the hair tip of each hair bundle 4 is not limited to the concave shape as shown in FIG. An arbitrary surface shape as shown in ()) can be adopted. Each drawing in FIG. 3 shows only the hair bundle shape on the upper side of the head portion, and illustration of a portion embedded in the head portion is omitted.

When the entire surface 6 is flat as shown in FIG. 3 (a), more bristle tips and dentifrice can uniformly act on the smooth tooth surface. Also, if the whole is formed to have a substantially concave shape as shown in FIG. 2 or FIGS. 3 (b), (f), (g), (h), and (i), the holding effect of the dentifrice is improved. At the same time, it is easy to fit a complicated curved surface of the tooth, and the brushing property, particularly the polishing property, is improved. Also, if the entire surface is formed in a substantially convex shape as shown in FIGS. 3C and 3D or a surface which is entirely inclined in one direction as shown in FIG. The bristle tip can efficiently reach the depressed portion where plaque easily accumulates, and the brushing effect can be further enhanced. It is preferable that the shape of the surface formed by the tip of the bristle be appropriately selected and combined in accordance with the design purpose of the toothbrush.

The brush length of each bristle bundle 4 constituting the block pattern is set to a maximum height H = 6 to 12 mm as shown in FIG. 2 in consideration of the flexibility of the bristle bundle and the usability in the oral cavity.
(H = 6-11mm for children, H for adults)
(8 to 12 mm). Also,
When the surface 6 constituted by the tip of the hair tip of each bristle bundle 4 is formed on a surface other than a plane as shown in FIG. 2, the step d between the highest part and the lowest part is within 3 mm, more preferably d = 2 mm. Within this range, a toothbrush with excellent usability can be obtained.

The number of bristle bundles 4 arranged around the center point O to form one block pattern is not particularly limited, and may be two or more.
Number, preferably about 4 to 8 pieces.

The materials of the brushes constituting each bristle bundle 4 include:
A commonly used polyamide (for example, nylon 6-
12, nylon 6-10, 12 nylon, etc.), polyester (for example, polybutylene terephthalate, polyethylene terephthalate, etc.), polypropylene and the like can be used. Of course, a composite filament combining these may be used.

The cross-sectional shape of each brush is mainly a circular cross-section, but is not particularly limited. For example, if a brush having a polygonal cross section such as a quadrangle or a hexagon is used, it is possible to increase the flocking density more than usual, and if a brush having a bulky cross-sectional shape such as a star is used, the brush tip The porosity in the portion is increased, and the holding power of the dentifrice can be further increased.

The thickness of the brush constituting the bristle bundle 4 is 3 to 10
mil (0.076 to 0.254 mm), preferably 5
It is preferably about 8 mil (0.127 to 0.203 mm). Further, usually, a brush having the same diameter is used from the base end to the distal end except for the rounded portion of the bristle tip, but the brush is not limited to this. Even if there is, it is good also as a taper hair which diameter becomes small gradually toward a hair end.

The bristle bundles 4 in the same block need not have the same brush diameter even if they have the same cross-sectional shape. For example, 6 mil (0.152 mm) and 7 mil
(0.178mm), usability, brushing feeling,
It can be appropriately selected in consideration of the cleaning effect and the like. Further, the number of blocks formed on the flocking surface 2 may be one set, or two sets or more as shown.

In consideration of usability, brushing feeling, cleaning effect, etc., the overall shape of the block and the shape, arrangement pattern, brush diameter, etc. of each of the bundles constituting the block may be different for each block. Further, the entire flocked surface may be configured by combining with other hair bundles 7 other than the hair bundle 4 forming a unitary block pattern.

The material of the toothbrush handle including the head portion 1 may be a thermoplastic resin, for example, polypropylene, polyethylene, polyester, polyamide, cellulose propionate, polymethyl methacrylate, ABS or the like. can do. It is also preferable to use a multicolor molded handle in which these resins are combined with each other or with a thermoplastic elastomer. If the brush and handle constituting the bristle bundle 4 are made of the same material, it is advantageous in terms of disposal after use and recycling, and if a resin material having good biodegradability is used, good disposal can be achieved. be able to.

The bristle bundles 4 arranged around the center point O are not necessarily all the same in shape and are not necessarily equidistant from the center point O. As will be apparent from other shape examples described later, Any combination of shapes and distances may be used. It is preferable that the number of hair bundles having the same cross-sectional shape is large from the viewpoint of hair management used for mold production and production. When 50 to 100% of the hair bundle groups constituting one block pattern have the same cross-sectional shape, the brush is cleaned. This is more preferable because unevenness of polishing and polishing are reduced and uniformity is improved.

The greater the number of bristle bundles equidistant from the center point O, the higher the symmetry, so that unevenness in brushing and polishing is reduced and uniformity is improved. In particular, when 50 to 100% of the hair bundle groups constituting one block pattern are arranged at the same distance, the unity of the hair bundle groups becomes higher, unevenness of brushing and polishing is reduced, and uniformity is further improved. Also, the aesthetic appearance of the toothbrush is more preferable.

If the cross-sectional shape of each individual hair bundle 4 is line-symmetric with respect to the axis passing through the center point O, the symmetry of the entire block is improved, and unevenness in brushing and polishing is reduced, and uniformity is improved. Become. It is not necessary that all the block patterns be line-symmetrical patterns, but 50 to 50 of a plurality of block patterns formed on the flocked surface 2 may be used.
It is more effective if 100% is a line-symmetric block pattern. The hair bundles constituting the block are not limited to the hair bundles arranged around the center point, but may be arranged at positions including the center point.

In the case of the present invention, since the hair bundle 4 needs to have a hair bundle denseness of 64% or more, the above-described method of implanting hair with a flat line cannot be employed. For this reason, in producing the toothbrush of the present invention, a flocking method that does not use a flat wire,
For example, an in-mold method (see Japanese Patent Publication No. 6-16725, JP-A-61-268208, and JP-A-2-111305) and a heat fusion method (Japanese Patent Publication No. 6-46962,
No. 99002) is used. For example, after the bundled brushes are adjusted to a predetermined bristle density, bristle shape, and bristle tip shape, the bristle bundle end opposite to the bristle tip is melted and fixed by means of heat or the like, and this is fixed. It is manufactured by implanting hairs on the head portion by a molding method, a heat fusion method, or the like.

In this manner, in the case of the hair transplanting method using no flat wire, the density of the hair bundle is determined by a mold, a sleeve, or the like used when the hair bundle base end is melted and integrated by thermal means. Or the cross-sectional area of the mold or sleeve used when implanting the hair bundle base end into the head portion by a method such as heat fusion or in-mold, and the total of each brush constituting the hair bundle It can be obtained by the ratio with the cross-sectional area.

As a method of shaping the shape of the tip end surface 6 of the hair bundle 4 so as to have a predetermined surface shape as shown in FIG. 2 or FIGS. After implanting the hair in the buried hole of the implanted surface, the hair may be trimmed using a cutter so that the entire hair bundle group has a predetermined surface shape. Further, after the brushes constituting each bristle bundle are arranged to have an arbitrary constant length, the brushes in the bristle bundle are moved up and down with respect to each other so that the tip end of each bristle bundle has a desired shape. Then, the opposite ends of the bristle bundle are trimmed, and the trimmed ends of the bristle bundle are melted by thermal means to form a hypertrophied portion. The hypertrophy is formed by the above-described in-mold method or heat fusion method. It can also be manufactured by planting hairs in a part.

FIGS. 4 to 11 show other examples of the block pattern formed by the plurality of hair bundles 4. As described above, it is desirable that one block pattern has a visually coherent hair bundle configuration and is arranged so that the respective hair bundles maintain an appropriate interval. When the distance between the bristle bundles is maintained at least about 0.5 mm, the flexibility of each bristle bundle is maintained and the dentifrice is easily held, which is more effective.

Although various embodiments of the present invention have been described above, each bristle bundle 4 forming a block pattern is actually a set of brushes. Sometimes there is no clear cross section,
It is acceptable. Also, due to the processing of a mold for shaping the cross-sectional shape of the hair bundle 4, the actual hair bundle may not form a clear corner particularly at the corner, and the corner R may be formed. Is also acceptable.

The present invention is not limited to the above-described embodiment, and various modifications and applications can be made in accordance with the gist of the invention.

[0039]

According to the toothbrush of the present invention described above, the following excellent effects can be obtained. (1) A plurality of hair bundles having a hair bundle density of 64% or more are arranged around a center point using a hair bundle having a hair density of 64% or more. A group of block patterns is formed around a point, at least one block pattern composed of the plurality of hair bundle groups is provided, and the outside of the hair bundle of the hair bundle group forming the block pattern is connected by a straight line. Since the ratio of the sum of the cross-sectional areas of all the hair bundles constituting the block pattern to the obtained block area (hair bundle occupancy ratio) is 35% or more, the dentifrice is easily retained in the hair bundle group during brushing, Further, since the flocking density per unit area is high, it is possible to efficiently and effectively perform tooth cleaning, particularly polishing. For this reason, it is possible to simultaneously satisfy both the holding power of the dentifrice and the brushing property of the tooth, particularly the polishing property.

(2) A hair bundle having a hair density of 64% or more is used, a plurality of hair bundles having a hair density of 64% or more are arranged around a center point, and a plurality of these hair bundles are placed. The group forms a block pattern around the center point,
A brush pattern forming the block pattern with respect to a block area obtained by connecting at least one block pattern constituted by the plurality of hair bundle groups with the outside of the hair bundle of the hair bundle group forming the block pattern by a straight line; Since the ratio of the total cross-sectional area (density of the block) is 22% or more, the dentifrice is easily retained in the bristle bundle during brushing, and the tooth transplantation density per unit area is high. Cleaning, especially polishing, can be performed efficiently and effectively. For this reason, it is possible to simultaneously satisfy both the holding power of the dentifrice and the brushing property of the tooth, particularly the polishing property.

(3) The ratio of the block area of one block pattern to the flocking area obtained by connecting the outside of the hair bundle of the whole flocking surface with a straight line is at least 4% or more, and the area of one block pattern is a certain size. As described above, the holding power of the dentifrice and the polishing properties of the teeth can be further improved. (4) In the case where a plurality of block patterns are formed, the ratio of the sum of the block areas of the plurality of block patterns to the flocking area obtained by connecting the outside of the hair bundle of the entire flocking surface with a straight line is 10% or more. Since the total sum of the block area and the area of the flocked surface is set to be a certain ratio or more, the holding power of the dentifrice and the polishability of the teeth can be further improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a head portion showing a first embodiment of a toothbrush according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIGS. 3A to 3I are diagrams showing another example of the surface shape of the tip of the hair tip.

FIG. 4 is a plan view of a head portion showing a second embodiment of the toothbrush according to the present invention.

FIG. 5 is a plan view of a head portion showing a third embodiment of the toothbrush according to the present invention.

FIG. 6 is a plan view of a head portion showing a fourth embodiment of the toothbrush according to the present invention.

FIG. 7 is a plan view of a head portion showing a fifth embodiment of the toothbrush according to the present invention.

FIG. 8 is a plan view of a head portion of a toothbrush according to a sixth embodiment of the present invention.

FIG. 9 is a plan view of a head part showing a seventh embodiment of the toothbrush according to the present invention.

FIG. 10 is a plan view of a head portion showing an eighth embodiment of the toothbrush according to the present invention.

FIG. 11 is a plan view of a head portion showing a ninth embodiment of a toothbrush according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head part 2 Flocked surface 3 Buried hole 4 Hair bundle 5 Brush (filament) which constitutes a hair bundle 6 Hair bundle tip surface 7 Hair bundle 8 Block composed of hair bundle group

Continued on the front page (72) Inventor Takao Kato 1-37 Honjo, Sumida-ku, Tokyo F-term in Lion Corporation (reference) 3B202 AA06 BA02 DB01 EA01 EF01 EF02 EF04 EF06 EF10 EG03 HA03

Claims (4)

[Claims] 1. A toothbrush having a plurality of bristle bundles each having a bundle of brushes planted on a flocked surface of a head portion, wherein the bristles having a bristle densities of 64% or more are used. A plurality of bundles are arranged around a certain center point, and a group of block patterns are formed around the center point by the plurality of hair bundle groups, and at least a block pattern constituted by the plurality of hair bundle groups is formed. A ratio of the sum of the cross-sectional areas of all the hair bundles constituting the block pattern to the block area obtained by connecting the outside of the hair bundle of the hair bundle group forming the block pattern with a straight line (hair bundle occupancy ratio) Is 35% or more. 2. A toothbrush having a plurality of bristles bundled with brushes on a flocked surface of a head portion, wherein the bristles having a bristles density of 64% or more are used. A plurality of bundles are arranged around a certain center point, and a group of block patterns are formed around the center point by the plurality of hair bundle groups, and at least a block pattern constituted by the plurality of hair bundle groups is formed. The ratio of the total cross-sectional area of the brushes constituting the block pattern to the block area obtained by connecting the outside of the hair bundle of the hair bundle group forming the block pattern with a straight line (block dense hair density) is at least 22. % Or more. 3. The method according to claim 1, wherein the ratio of the block area of one block pattern to the flocked area obtained by connecting the outside of the hair bundle of the entire flocked surface with a straight line is at least 4% or more. toothbrush. 4. In the case where a plurality of block patterns are formed, the ratio of the sum of the block areas of the plurality of block patterns to the flocking area obtained by connecting the outside of the hair bundle of the entire flocking surface with a straight line is set. The toothbrush according to any one of claims 1 to 3, wherein the content is 10% or more.