Tooth Brush

Abstract

A tooth brush of this invention is characterized by comprising a handle (10) linerly formed in the longitudinal direction so that it may be held by hand and a head (12) bent and extended at an angle of 20° to 70° to the left side against the extensional direction of the said handle (10) and further bent and extended at an angle of 10° to 40° to the rear side of the prominent tooth brush against the axis parallel with the handle (10). The capacity to remove plaque of the tooth brush of this invention improves noticeably compared that of conventional tooth brush. Furthermore, when one brushes one's teeth in every nook and corner, using the tooth brush of this invention decreases the fatigue of one's wrist and arm substantially, compared with the conventional tooth brush.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing the structure of the tooth brush according to an example of this invention.

FIG. 2 is a front view showing the structure of the tooth brush according to an example of this invention.

FIG. 3 is a side view showing the structure of the tooth brush according to an example of this invention.

MODE FOR THE INVENTION

Hereafter, a preferable example of this invention is described in detail by reference to the accompanying drawings.

FIG. 1 is a perspective view showing the structure of the tooth brush according to an example of this invention. FIG. 2 is a front view showing the structure of the tooth brush according to an example of this invention. FIG. 3 is a side view showing the structure of the tooth brush according to an example of this invention.

As shown in the figures, a tooth brush of this invention is characterized by comprising a handle (10) linearly formed in the longitudinal direction so that it may be held by hand and a head (12) bent and extended with an elliptical curve being formed at an angle of 20° to 70° to the left side against the extensional direction of the said handle (10) and further bent and extended with an elliptical curve being formed at an angle of 10° to 40° to the rear side of the prominent tooth brush against the axis parallel with the handle (10).

When a right-handed person brushes the rear surface of the lower incisor with a conventional tooth, he/she has to raise his/her hand holding the handle of the tooth brush higher than his/her cavity and the direction in which he/she brushes the teeth is extended. This leads to a small surface area to contact with the brush and further easy tilt of the front part of the brush. After all, this leads to fast deterioration of the tooth brush's cavity to remove plaque. Meanwhile, the tooth brush of this invention has the head (12) bent and extended with an elliptical curve being formed against the direction in which the handle (10) is extended. In this connection, it has been discovered that when one brushes one's teeth with the said tooth brush and a part between the handle (10) and the head (12) gets in touch with one's lips, one feels much less uncomfortableness. That is to say, it is preferable to extend the head in the elliptical form, compared to the circular form.

Meanwhile, when one brushes one's teeth with the handle (10) of the tooth brush of this invention with one's right hand, the brush gets to be well in contact with every nook and corner of the anterior and posterior teeth of the upper and lower teeth so that its capacity to remove plaque gets to be substantially increased and further, one feels less tired in one's wrist and arm, compared with the case that one uses a conventional tooth brush with the same tooth paste for the same time by the same method.

In addition, the tooth brush of this invention induces a user to brush the teeth by moving the tooth brush in the vertical direction so that it helps the user get rid of a bad habit of brushing the teeth horizontally. Particularly, while it's difficult for the conventional tooth brush to reach the rear surface of the upper or lower teeth, thanks to its enhanced accessability to those area, the tooth brush of this invention remove the plaque efficiently. When one brushes one's teeth with the conventional tooth brush in the horizontal direction, tooth paste often gets to go between hair of the brush so that a lot of tooth paste fails to be used in the actual brushing one's teeth, which results in a large consumption of tooth paste, while the tooth brush of this invention can reduce a consumption of tooth paste by inducing the user to brush the teeth in the vertical direction.

However, in case the head is bent and extended from the said handle (10) at an angle below 20° to the left side against the direction in which the said handle (10) is extended, the accessability to the rear surface area of the upper and lower teeth, where the brush of the conventional tooth brush is not well contact with in a usual posture, is not improved much. And in case the head is bent and extended from the said handle at an angle over 70° to the left side against the direction in which the said handle (10) is extended, the user complains of uncomfortableness resulting from the touch of the handle with his/her lips. Therefore, only in case the head (12) is bent and extended from the said handle (10) with an elliptical curve being formed at an angle of 20° to 70° to the left side against the direction in which the said handle (10) is extended, the objective of this invention can be attained.

Meanwhile, in case the head is bent and extended at an angle below 10° to the rear side of the prominent tooth brush against the axis parallel with the handle (10), the accessability to the rear surface area of the upper and lower teeth, where the brush of the conventional tooth brush is not well contact with in a usual posture, is not improved much. And in case the head is bent and extended at an angle of over 40° to the rear side of the prominent tooth brush against the axis parallel with the handle (10), the user complains of poor engagement between the brush and the teeth. Therefore, only in case the head (12) is bent and extended with an elliptical curve being formed at an angle of 10° to 40° to the rear side of the prominent tooth brush against the axis parallel with the handle (10), the objective of this invention can be attained.

Of course, even if one uses the conventional tooth brush, one can brush one's teeth in every nook and corner with care, like the case of using the tooth brush of this invention, but the user gets to feel tired easily in his wrist and arm, and the brush also gets to be abraded fast. This is a noteworthy problem.

200 subjects, who were randomly selected for a comparative experiment, were divided into two groups, and each group consisted of 100 subjects. 100 subjects of the one group were let to use the conventional tooth brush, while the other 100 subjects of the other group were let to use the tooth brush of this invention. Except the tooth brush, both groups brushed teeth under the same conditions, that is to say, both groups used the same tooth paste, the same brushing method and the same time. Then, the number of subjects complaining of feeling tired and exch tooth brush's capacity to remove plaque from the anterior teeth of the lower teeth were compared between both groups. The results of this experiment are shown in Table 1.

	TABLE 1
		Removal of plaque
	Number of	from anterior
	subjects feeling tired	teeth of lower teeth (%)
		Using		Using
	Using tooth	conventional	Using tooth	conventional
	brush of this	tooth	brush of this	tooth
	invention	brush	invention	brush
	(Group 1)	(Group 2)	(Group 1)	(Group 2)
30	seconds	0	1	25%	12%
1	minutes	0	3	36%	18%
1	minutes	2	14	54%	27%
30	seconds
2	minutes	7	25	71%	35%
2	minutes	12	38	85%	46%
30	seconds
3	minutes	22	52	92%	57%
3	minutes	28	57	95%	72%
30	seconds
4	minutes	35	65	97%	78%
5	minutes	46	85	98%	85%
7	minutes	52	92	98%	90%
10	minutes	75	100	99%	95%

Compared with the conventional tooth brush, the tooth brush of this invention has a much enhanced capacity to remove plaque from the rear surface of the upper and lower teeth that is difficult to be brushed, and further has an effect that the user feels much less tired in his wrist and arm when he/she brushes the teeth in every nook and corner.

INDUSTRIAL APPLICABILITY

As mentioned above, the tooth brush of this invention has a much enhanced capacity to remove plaque from the rear surface of the upper and lower teeth that is difficult to be brushed, and further has an effect that the user feels much less tired in his wrist and arm when he/she brushes the teeth in every nook and corner, compared with the conventional tooth brush. In addition, the tooth brush of this invention induces a user to brush the teeth by moving the tooth brush in the vertical direction so that it helps the user get rid of a bad habit of brushing the teeth horizontally. Particularly, thanks to the enhanced accessability to the rear surface of the upper and lower teeth, the tooth brush of this invention has much improved capacity to remove plaque. And the tooth brush of this invention can reduce a consumption of tooth paste by inducing the user to brush the teeth in the vertical direction.

Claims

1. A tooth brush, wherein it is characterized by comprising a handle (10) linerly formed in the longitudinal direction so that it may be held by hand and a head (12) bent and extended at an angle of 20° to 70° to the left side against the extensional direction of the said handle (10) and further bent and extended at an angle of 10° to 40° to the rear side of the prominent tooth brush against the axis parallel with the handle (10).

2. A tooth brush according to claim 1, wherein the said head (12) is bent and extended with an elliptical curve being formed against the direction in which the head is extended from the handle (10).