CN111556718A

CN111556718A - Tooth brush

Info

Publication number: CN111556718A
Application number: CN201880085207.XA
Authority: CN
Inventors: 金勉寿
Original assignee: Co Details
Current assignee: Co Details
Priority date: 2018-03-29
Filing date: 2018-09-11
Publication date: 2020-08-18
Also published as: JP2021512658A; WO2019190004A1; EP3777607A1; EP3777607A4; US20210068526A1; RU2020123469A; RU2020123469A3

Abstract

The present invention relates to a toothbrush, and more particularly, to a toothbrush which can more effectively remove all food residues adhering between teeth and on the surfaces of teeth by allowing a pair of bristles formed of a first bristle having a fine end and a second bristle having a flat end to be in a bristle bundle form, and can also effectively remove food residues caught between teeth and a mouthpiece in the case of installing the mouthpiece.

Description

Tooth brush

Technical Field

Background

Toothbrushes are known for brushing teeth, which maintain the cleanliness of teeth by removing debris attached to the surfaces of or between teeth due to ingestion of food.

The conventional toothbrush includes a head (head) and a handle (handle) in which bristles are implanted in a bundle form in a row, and distal end portions of the plurality of bristles are formed in a flat line shape.

However, as described above, the conventional toothbrush having the flat in-line bristles has a problem in that not only food residues between teeth cannot be effectively removed, but also it is difficult to effectively remove all food residues attached to the surfaces of the teeth.

On the other hand, in recent years, an operation for diagnosing, preventing and treating abnormal arrangement of teeth or facial growth by orthodontic treatment (orthodontic treatment) has been widely used.

Among them, orthodontic treatment not only trims the crooked teeth, but also makes the teeth to perform normal functions by correcting various bone disorders that can occur during the growing process, thereby making it possible to shape healthy oral tissues and beautiful faces.

The surgical method of orthodontic treatment is roughly divided into orthodontic diagnosis and orthodontic treatment process, the orthodontic diagnosis includes a process of establishing a treatment plan suitable for an individual by analyzing problems of a patient by means of data such as a preliminary examination, an X-ray, a tooth model, a facial photograph, and an intra-oral photograph, and the orthodontic treatment includes a process of adjusting movement of teeth and growth of jawbone by means of a fixed orthodontic device, a removable orthodontic device, an extra-oral device, and the like.

After such an orthodontic treatment operation, it takes at least 18 to 30 months to perform orthodontic treatment, and a complicated orthodontic device is highly dangerous for tooth decay and gum disease, so careful tooth brushing is required.

However, as described above, the conventional toothbrush having the flat in-line bristles has problems in that it is not only difficult to carefully brush teeth while preventing damage to the orthodontic appliance, but also food residues interposed between the orthodontic appliance and the teeth cannot be effectively removed.

In particular, the existing toothbrush has never disclosed a formation structure having bristles dedicated to molar teeth or a toothbrush structure having bristles for a dental implant operator.

Disclosure of Invention

Technical problem

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 can remove food residues adhering between teeth and on the surfaces of the teeth more effectively by forming a pair of bristles, which are formed of a first bristle having a fine end and a second bristle having a flat end, in a tuft form, thereby enabling careful brushing.

It is still another object of the present invention to provide a toothbrush in which bristles are separately formed from outer bristles and inner bristles to enable fine brushing between an orthodontic device and teeth.

It is another object of the present invention to provide a toothbrush which can more effectively clean food residues of molars by forming separate molars at one corner of a head.

It is still another object of the present invention to provide a toothbrush capable of providing an elastic restoring force while further removing food residues attached to the surfaces of teeth by embossing a plurality of bristles.

It is still another object of the present invention to provide a toothbrush which can be effectively used for a dental implant operator by forming tufts of toothbrush bristles in only two rows at the center of one surface of a toothbrush head in a length direction.

Means for solving the problems

In order to achieve the above object, a toothbrush of the present invention includes a head and a handle connected to one side of the head, and is characterized by comprising bristles formed of tufts of first bristles having fine end portions corresponding to teeth and second bristles having flat end portions corresponding to tooth surfaces on the inner side of the first bristles, the bristles being arranged in a plurality of rows on one side of the head.

Preferably, the bristles are formed by outer bristles and inner bristles, the outer bristles are formed of bundles of the first and second bristles and are set in an outer portion of one surface of the toothbrush head, and the inner bristles are formed of bundles of the first and second bristles and are set in the toothbrush head so as to be arranged in the outer bristles.

Also, it is preferable that the outer bristles and the inner bristles are formed with different lengths from each other to be arranged in a V-shaped end surface.

And, preferably, further comprises molar bristles implanted in a plurality of rows outside one surface of the toothbrush head in a bundle form in which end portions of a plurality of unit bristles are inclined downward.

And, the above-mentioned molar tooth toothbrush hair is ordinary hair or fine hair, the above-mentioned toothbrush hair can be fine hair.

Further, it is preferable that the molar tooth bristles are formed in a bundle shape in a plurality of rows at a corner portion of one surface of the brush head.

Also, it is preferable that the first bristles have a tapered shape in which an outer diameter is tapered in a direction along an outer end.

Also, it is preferable that the length of the second bristles including the flat end portion is smaller than the length of the first bristles.

Preferably, the first bristles and the second bristles are embossed at outer edges thereof.

Also, preferably, the embossing is formed at the outer edge of the molar tooth bristles.

Also, it is preferable that the upper ends of the unit bristles of the molar bristles have flat ends.

Preferably, the bristle bundles formed by the pair of first bristles and second bristles and the bristle bundles of the molar teeth are formed in two rows at the center of one surface of the toothbrush head in the longitudinal direction.

ADVANTAGEOUS EFFECTS OF INVENTION

As described above, the toothbrush of the present invention has an effect that food residues adhering between teeth and on tooth surfaces can be more effectively removed by allowing a pair of bristles, which are formed of the first bristles having fine ends and the second bristles having flat ends, to take a tuft shape.

Also, the present invention has an advantage in that since the ends of the outer bristles and the inner bristles implanted and separated at right angles to the upper surface of the toothbrush head are arranged in the V-shaped ends, it is possible to brush finely between the orthodontic device and the teeth, thereby minimizing a sense of discomfort caused by enamel abrasion, gum damage, toothbrush depilation, etc.

Also, the present invention has an advantage in that since a plurality of bristle ends are individually formed into molar bristles in a downwardly inclined form along an inner side at one face corner portion of a toothbrush head, food residues of the molar teeth can be completely removed.

Also, the present invention has the effect that food residue on the surface of teeth can be further removed by forming the embossments on a plurality of bristles, and at the same time, an elastic restoring force can be provided, and the generation amount of foam can be increased when toothpaste is used through the spaces between the embossments, so that refreshing feeling can be maintained.

Also, the present invention has an advantage in that it can be effectively used as a toothbrush for a dental implant operator because the tufts of bristles are formed only in two rows at the center of one surface of the head in the length direction.

Drawings

FIG. 1 is a top view of a toothbrush in accordance with one embodiment of the present invention.

Fig. 2 is a bottom view of a toothbrush in accordance with one embodiment of the present invention.

Fig. 3a is a sectional view taken along line a-a of fig. 1.

Fig. 3B is an enlarged view of the "B" portion of fig. 1.

Fig. 3c is an exemplary view showing a use state of the toothbrush according to one embodiment of the present invention.

Fig. 4a is a cross-sectional view taken along line a-a of fig. 1 in accordance with yet another embodiment of the present invention.

Fig. 4B is an enlarged view of a portion "B" of fig. 1 to enlarge another embodiment of the present invention.

Fig. 4c is an exemplary view showing a use state of a toothbrush according to still another embodiment of the present invention.

Fig. 5 is a perspective view and an enlarged view of a portion "C" of a toothbrush according to yet another embodiment of the present invention.

Fig. 6 is a top view of a toothbrush in accordance with yet another embodiment of the present invention.

Detailed Description

The present invention may be embodied in other various forms without departing from the technical spirit or essential characteristics thereof. Thus, an embodiment of the present invention is illustrative in all respects and should not be construed as limiting.

Although the terms first, second, etc. are used to describe various structural elements, the terms are not limited to the structural elements.

The above terms are only used to distinguish one structural element from another. For example, a first structural element may be named a second structural element, and similarly, a second structural element may also be named a first structural element, without departing from the scope of the invention as claimed.

When a structural element is referred to as being "connected" or "coupled" to other structural elements, it is to be understood that the structural element may be directly connected or coupled to the other structural elements, but other structural elements may be present therebetween.

On the contrary, when it is referred to that a certain structural element is "directly connected" or "directly coupled" to other structural elements, it is understood that no other structural element exists therebetween.

The terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless a different meaning is explicitly stated in context, an expression in the singular includes an expression in the plural.

In the present application, terms such as "including" or "having" are used to designate the presence of the features, numbers, steps, actions, structural elements, components or combinations thereof described in the specification, and are not to be construed as excluding the presence or addition possibility of one or more other features, numbers, steps, actions, structural elements, components or combinations thereof in advance.

Unless defined otherwise, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms commonly used such as terms defined in dictionaries should be interpreted as having the same meaning as that of a context of the related art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the present invention can be easily implemented by those skilled in the art to which the present invention pertains.

Fig. 1 is a plan view of a toothbrush according to an embodiment of the present invention, fig. 2 is a bottom view of a toothbrush according to an embodiment of the present invention, fig. 3a is a sectional view taken along line a-a of fig. 1, fig. 3B is an enlarged view of a portion "B" of fig. 1, and fig. 3c is an exemplary view illustrating a use state of a toothbrush according to an embodiment of the present invention.

As shown in the drawings, the toothbrush for orthodontics of the present invention includes a head 10, a handle 20 connected to one side of the head, and bristles 100, the bristles 100 being formed of tufts of first bristles 110 and second bristles 120 arranged in a plurality of rows on one surface of the head 10, the first bristles 110 having fine tips 111 corresponding to teeth during brushing, and the second bristles 120 having flat tips 121 corresponding to surfaces of the teeth on the inner side of the first bristles.

Preferably, the head 10 and the handle 20 are integrally formed of a single synthetic resin having appropriate strength and hardness, and a neck portion 30 having a small thickness is formed between the head 10 and the handle 20.

As shown in fig. 1 and 3a, the toothbrush head 10 has a structure in which bristles 100 are planted in a plurality of rows, has a substantially flat plate shape, the bristles 100 are planted on the upper surface 11 of the toothbrush head 10, and corners of front and rear ends thereof are rounded so as to be easily inserted into or withdrawn from the mouth.

Referring to fig. 2, a tongue fur removing member 40 is formed at the bottom surface 12 of the toothbrush head 10, and this tongue fur removing member 40 includes: a base 41 inserted into the bottom surface of the toothbrush head 10; and a tongue coating removal protrusion 42 integrally formed with the surface of the base 41. The tongue coating removing protrusions 42 are formed in plural in the left and right width direction of the brush head 10 with a predetermined interval.

Thus, the tongue coating removing member 40 can remove the white or yellowish brown substances attached to the tongue coating by scraping. The tongue fur-removing member 40 has a prescribed elasticity and friction coefficient, is made of a synthetic resin material different from the head 10, and is formed on the bottom surface of the head 10 in an embedded manner.

As shown in fig. 1 and 2, the toothbrush handle 20 is configured to brush teeth while being held by a hand, and slip of the held hand is prevented by forming the slip prevention member 21 on the upper surface and the bottom surface. As shown in fig. 1, the slip prevention part 21 may be formed of a plurality of protrusions protruding from the surface of the toothbrush handle 20. As shown in fig. 2, the slip prevention part 21 may be formed in a rectangular shape on the surface of the handle 20 and protruded or formed on the same plane.

As shown in fig. 1 and 3b, the bristles 100 are formed of a bundle of a pair of first bristles 110 having fine end portions 111 and second bristles 120 having flat end portions 121, and are planted in a plurality of rows over the entire upper surface of the head 10 along the longitudinal direction of the toothbrush body.

Referring to fig. 3a, the first bristles 110 are tapered at their ends in the length direction and have sharp minute ends 111 at the outer ends, and the minute ends 111 remove food residues caught between the teeth 1 and the teeth 1.

A plurality of first embossings 112(embossing) are formed in a ring shape at the outer edge of the first bristles 110 such that a predetermined interval is left along the length direction of the first bristles 110, and the plurality of first embossings 112 may be formed to have a tapered outer diameter similar to or the same as the outer surface of the first bristles 110.

The plurality of first embossings 112 formed in the above-described manner may be inserted between the teeth 1 and the teeth 1 to remove food residues that are not removed by the minute end portions 111 or food residues attached to the surface of the teeth 1 in a scraping manner. The first bristles 110 have elasticity by the first embossing 112, thereby further having a function of restoring to an original shape after brushing teeth.

Referring to fig. 3a, the second bristles 120 have a cylindrical shape having an outer diameter the same as or similar to the outer diameter of the first bristles 110 on the root side, and have flat end portions 121 on the outer ends thereof, the flat end portions 121 removing food residues attached to the surfaces of the teeth 1 in a scraping manner, and the length of the second bristles 120 including the flat end portions 121 is smaller than that of the first bristles 110.

And, second embossings 122 are formed in a ring shape at the outer edge of the second bristles 120, and such second embossings 122 are formed in plural at regular intervals along the length direction of the second bristles 120, and preferably, the plural second embossings 122 are formed to have the same outer diameter. The second bristles 120 have elastic force by the second embossings 122, thereby further having a function of restoring to the original shape after brushing teeth.

Among them, it is preferable to use fine bristles thinner than general bristles for the first bristles 110 and the second bristles 120 in order to prevent gum damage.

Hereinafter, the operation of the toothbrush of the present invention configured as described above will be described in detail with reference to fig. 3a to 3 c.

Referring to fig. 3b, the first bristles 100 are implanted in a plurality of rows at positions corresponding to the outside of the toothbrush head, and in the state of fig. 3c, when a user holds the handle with his or her hand and brushes the teeth 1 in such a manner as to push in the front-rear or right-left direction, the minute end portions 111 of the first bristles 110 remove food residues caught between the teeth in such a manner as to be pushed or scraped by being inserted between the teeth 1 and the teeth 1, and the plurality of first embossings 112 remove food residues not removed by the minute end portions 111 or food residues stuck to the surfaces of the teeth 1 in such a manner as to be scraped in the axial direction.

Meanwhile, the flat end 121 of the second bristle 120 removes food residues attached to the surface of the tooth 1 in a manner of scraping in the orthogonal direction to the axis, and the second emboss 122 removes food residues attached to the surface of the tooth 1 in a manner of scraping in the axis direction.

Also, the toothbrush of the present invention can remove food residues attached to the surface of the teeth 1 more effectively by embossing, while having elasticity, and thus not only is excellent in restorability, but also more refreshing feeling can be maintained by increasing the generation amount of bubbles when toothpaste is used through the spaces between the embossings.

Fig. 4a is a sectional view taken along line a-a of fig. 1 in accordance with still another embodiment of the present invention, fig. 4B is an enlarged view of portion "B" of fig. 1 to enlarge another embodiment of the present invention, fig. 4c is an exemplary view illustrating a state of use of a toothbrush in accordance with yet another embodiment of the present invention, in which bristles are separately formed of outer bristles 200 implanted outside one surface of a head 10 and inner bristles 300 implanted inside the head 100 in such a manner as to be arranged inside the outer bristles 200, the outer bristles 200 and the inner bristles 300 are formed with different lengths from each other to be arranged in V-shaped end surfaces, which is different from the bristles of fig. 3a to 3c in structure, and hereinafter, the difference will be described centering on the difference.

The outer bristles 200 have substantially the same structure as the bristles 100 of the first embodiment, and are formed of bundles in which a pair of first bristles 210 having fine end portions 211 and second bristles 220 having flat end portions 221 are bundled, and are planted in one or more rows along left and right side edges (left and right dotted quadrangles of fig. 4 b) corresponding to the outer portions of the upper surface of the head 10, as shown in fig. 4.

Also, as shown in fig. 4a, first embossings 212 and second embossings 222 are formed on the outer edges of the first bristles 210 and the second bristles 220 of the outer bristles 200, respectively, in the same manner as described above, and a plurality of the first embossings 212 are formed to have a tapered (taper) outer diameter, and preferably, a plurality of the second embossings 222 are formed to have the same outer diameter.

The inner bristles 300 have substantially the same structure as the outer bristles 200, and are formed of a bundle of a pair of first bristles 310 having fine end portions 311 and second bristles 320 having flat end portions 321, and are planted in one or more rows along a longitudinal direction of a center corresponding to the inside of the upper surface of the head 10 (a center one-dot chain line quadrangle of fig. 4 b), as shown in fig. 4 b. Also, since the inner bristles 300 have a length smaller than that of the outer bristles 200, the outer bristles 200 and the inner bristles 300 implanted in the upper surface of the head 10 are constructed in a substantially V-shaped end surface configuration as shown in FIG. 4 a.

Also, as shown in fig. 4a, first embossings 312 and second embossings 322 are formed at the outer edges of the first bristles 310 and the second bristles 320 of the inner bristles 300, respectively, in the same manner as described above, and a plurality of the first embossings 312 are formed to have a tapered (taper) outer diameter, and preferably, a plurality of the second embossings 322 are formed to have the same outer diameter.

Hereinafter, the operation of the toothbrush according to the further embodiment of the present invention configured as described above will be described in detail with reference to fig. 4a to 4 c.

Referring to fig. 4b, the outer bristles 200 are planted in one or more rows at positions corresponding to the outside of the head 10, and the inner bristles 300 are planted in one or more rows at positions corresponding to the inside of the head 10.

Fig. 4c is a view exemplarily showing a state that a toothbrush of the present invention is approached for brushing one surface of a tooth 1 provided with an orthodontic device 3, and as shown in fig. 4c, outer bristles 200 are configured to brush one surface of the tooth 1 and inner bristles 300 are configured to brush the orthodontic device 3.

In the state as shown in fig. 4c, when a user holds the handle with a hand and brushes his/her teeth by pushing it back and forth or right and left along the teeth 1, the minute end portion 211 of the first bristle 210 of the above-described outer bristles 200 removes food residues caught between the teeth by being inserted between the teeth 1 and the teeth 1 in a pushing or scraping manner, and the first embossings 212 remove food residues not removed by the minute end portion 111 or food residues stuck to the surface of the teeth 1 in a scraping manner in the axial direction.

Meanwhile, the flat end 221 of the second bristles 220 of the outer bristles 200 removes food residues attached to the surfaces of the teeth 1 in a manner of scraping in the orthogonal direction to the axis, and the second embossings 222 removes food residues attached to the surfaces of the teeth 1 in a manner of scraping in the axial direction.

On the other hand, the fine end 311 of the first bristles 310 of the inner bristles 300 removes biological residues interposed between the outer surface of the orthodontic appliance 3 and the teeth 1 in a scraping manner, and the first embossings 312 remove food residues that are not removed by the fine end 111 or food residues attached to the surface of the orthodontic appliance 3 in an axial scraping manner.

Meanwhile, the flat end 321 of the second bristles 320 of the inner bristles 300 removes food residues attached to the surface of the orthodontic appliance 3 in a manner of scraping in the orthogonal direction of the axis, and the second embossings 322 removes food residues attached to the surface of the orthodontic appliance 3 in a manner of scraping in the axial direction.

As described above, the toothbrush of the present invention can minimize the uncomfortable feeling due to enamel abrasion, gum damage, and toothbrush depilation by making the end portions of the outer bristles 200 and the inner bristles 300 implanted at right angles to the upper surface of the head 10 in the shape of a "V".

Further, the toothbrush of the present invention has elasticity while removing food residues attached to the surfaces of the teeth 1 and the orthodontic device 3 more effectively by embossing, and thus, not only has excellent restorability, but also can maintain a more refreshing feeling by increasing the generation amount of bubbles when toothpaste is used through the space between the

first embossings

212 and 312 and the

second embossings

222 and 322.

As shown in fig. 5, the toothbrush according to the further embodiment of the present invention further comprises molar bristles 400, the molar bristles 400 being planted in a plurality of rows outside one surface of the head 10 in a tuft form in which the ends of a plurality of unit bristles 410 are inclined downward.

Among them, in order to brush the mortar teeth, it is more preferable that the mortar teeth bristles 400 are formed in a plurality of rows in a tuft shape at one corner of the toothbrush head 10.

Also, the ends of the unit bristles 410 of one molar tooth bristle 400 are in a downwardly inclined form gradually decreasing along the inner side, and the ends of each molar tooth bristle 400 spaced in a plurality of rows are also in a form gradually inclined downwardly along the inner side (along the bristle 100 side), so that the process of brushing the molar teeth is more natural, and it is more advantageous to completely remove food residues of the molar teeth.

Each unit bristle 410 of the above-described molar teeth bristles 400 may be either normal bristles having a flat end 411 or fine bristles having fine ends.

On the other hand, the length of each of the bristles 400 of the bristles in the bundle form is shorter than the length of the bristles 100 formed of a pair of the first bristles 110 and the second bristles 120 formed at one side thereof, which is more advantageous for brushing the molars.

Of course, each unit bristle 410 has elasticity by the third emboss 412 formed at the outer edge, and thus may further have a function of restoring its original shape after brushing.

Fig. 6 is a plan view of a toothbrush according to still another embodiment of the present invention, which is substantially the same as the embodiment of fig. 5 except for the bristles 500 for implantation by an implant operator.

That is, as shown in fig. 6, the bundle of bristles 500 formed of the pair of first bristles and the pair of second bristles is formed only in two rows along the center of one surface of the head 10, and is used as a toothbrush dedicated to a dental implant operator.

Of course, as shown in fig. 5 for example, the molar tooth bristles 400 are formed of tufts formed in a plurality of rows at one corner of the head 10.

In the center of the toothbrush head 10, the tufts of the molar teeth bristles 400 may be formed in two rows in the longitudinal direction side by side with the tufts of the bristles 500.

The above description of one embodiment of the invention is intended to be exemplary only, and numerous modifications and equivalent other embodiments will be apparent to those skilled in the art to which the invention pertains.

It is, therefore, to be understood that the invention is not limited to the details described in the foregoing description.

Therefore, the true technical scope of the present invention should be determined based on the technical idea of the appended claims. Further, it should be understood that the present invention includes the technical ideas of the present invention defined in the claims and all the modifications, equivalents and alternatives within the scope thereof.

Industrial applicability

The present invention provides a toothbrush bundled by a pair of bristles formed of a first bristle having a fine end and a second bristle having a flat end, so that not only can all food residues adhering between teeth and on the surface of teeth be more effectively removed, but also food residues sandwiched between teeth and a mouthpiece can be effectively removed in the case of mounting the mouthpiece, and thus can be effectively used in the field of toothbrushes.

Claims

1. A toothbrush comprises a toothbrush head and a toothbrush handle connected with one side of the toothbrush head, and is characterized in that,

the toothbrush includes bristles formed of bundles of first bristles having fine end portions corresponding to between teeth and second bristles having flat end portions corresponding to surfaces of the teeth on the inner side of the first bristles, and arranged in a plurality of rows on one surface of a toothbrush head.

2. The toothbrush of claim 1, wherein the bristles are separately formed of outer bristles formed of tufts of the first and second bristles and implanted into an outer portion of one surface of the head, and inner bristles formed of tufts of the first and second bristles and implanted into the head so as to be arranged inside the outer bristles.

3. The toothbrush of claim 2, wherein the outer bristles and the inner bristles are formed of different lengths from each other to be arranged in a V-shaped end surface.

4. The toothbrush of claim 1 further comprising molar bristles implanted in rows outwardly of one face of said head in a tuft pattern having a plurality of unit bristles with downwardly inclined end portions.

5. The toothbrush of claim 4, wherein said molar tooth bristles are normal or fine bristles, and said bristles are fine bristles.

6. A toothbrush according to claim 5 characterised in that the molar bristles are in tuft form in rows at the corners of one face of the head.

7. The toothbrush of claim 1 or 2, wherein the first bristles are tapered such that the outer diameter thereof is tapered in the direction of the outer end thereof.

8. A toothbrush according to claim 1 or 2, wherein the length of the second bristles, including said flat end, is less than the length of said first bristles.

9. The toothbrush of claim 1 or 2, wherein an embossing is formed on outer edges of the first bristles and the second bristles.

10. The toothbrush of claim 4 wherein said molar bristles are embossed at their outer edges.

11. The toothbrush of claim 4 wherein the upper ends of each unit of bristles of said molar bristles have flat ends.

12. A toothbrush according to claim 4 or 5, wherein the tufts of said bristles formed by a pair of said first bristles and said second bristles and the tufts of said mortar bristles are formed in only two rows in the center of one face of said head in the lengthwise direction.