Toothbrush

Abstract

To provide a toothbrush that can easily and surely brush, particularly, lateral sides of molars and premolars and rear surfaces of incisors. A toothbrush comprising a rod-like block handle and a bristle section having a bristle tuft unit composed with a plurality of bristle tufts and extended to the end part of the block handle, wherein the bristle tuft unit is equipped with a head-end bristle tuft unit disposed in the head end section and a level difference unit provided on the block handle side rather than on the head-end bristle tuft unit, having still shorter bristle tufts and at the same time, formed throughout a plane range larger than the head-end bristle tuft unit.

What is claimed is: 
     
         1 . A tooth brush, comprising:
 a rod-like block handle and a bristle section having a bristle tuft unit composed with a plurality of bristle tufts and extended to the end part of the block handle,   wherein the bristle tuft unit is equipped with a head-end bristle tuft unit disposed in the head end section and a level difference unit provided on the block handle side rather than on the head-end bristle tuft unit, having still shorter bristle tufts and at the same time, formed throughout a plane range larger than the head-end bristle tuft unit.   
     
     
         2 . The toothbrush according to  claim 1 , wherein the bristle tufts that form the level difference unit and are adjacent to the head-end bristle tuft unit has the shortest bristle tuft length, and at the same time, the bristle tufts are formed in such a manner that the bristle tufts gradually increase the size as they go towards the rear-end part. 
     
     
         3 . The toothbrush according to  claim 2 , wherein the hardness of bristles that compose the head-end bristle tuft unit is greater than that of bristles that compose the level difference unit. 
     
     
         4 . The toothbrush according to  claim 3 , wherein the bristle tuft unit is composed with bristle tufts disposed in a plurality of rows along the length direction and the width direction of the block handle, rows in the length direction are disposed in a larger number of rows than that in the width direction, the head-end bristle tuft unit is composed with two rows of bristle tufts along the length direction, and at the same time, the level difference unit is composed with 7 or more rows of bristle tufts along the length direction. 
     
     
         5 . The toothbrush according to  claim 4 , wherein the length of bristle tufts composing the head-end bristle tuft unit is 1 cm and at the same time, the length of bristle tufts on the third and the fourth rows that compose the level difference unit is 3 to 4 mm. 
     
     
         6 . The toothbrush according to  claim 5 , wherein the length of the bristle tufts in the last row in the length direction of the level difference unit is 1 cm. 
     
     
         7 . The toothbrush according to  claim 1 , wherein the diameter of the bristle tuft is 1 mm and is composed with 50 to 60 bristles, and each bristle tuft is arranged at intervals of 2 mm with the center of each bristle tuft set as a standard. 
     
     
         8 . The toothbrush according to any one of  claims 1  through  7 , wherein bristles forming the bristle tuft are formed at least one kind chosen from nylon and saturated polyester.