Toothbrush

Abstract

To provide a toothbrush that can obtain a high cleaning effect even when teeth are brushed with light pressure. The toothbrush 2-1 has a longitudinally extending handle 4, a brush hair attaching portion 6 formed at the tip of the handle 4, and a brush portion 8 comprising multiple brush hair bundles that are brush hair in the brush hair attaching portion 6. The handle 4 comprises; a grip portion 10 that is held in the hand; a neck portion 12 that is positioned between the grip portion 10 and the brush hair attaching portion 6 and supports the brush hair attaching portion 6. A brush portion 8 is formed in a mountain shape with the center of the brush hair attaching portion 6 in the longitudinal direction of the handle 4 being formed as the top.

What is claimed is: 
     
         1 . A toothbrush comprising: a long handle; a brush hair attaching portion formed at the tip of the handle; and a brush portion consisting of a plurality of brush hair bundles that are attached to the brush hair attaching portion, thereby forming the toothbrush capable of cleaning teeth with the brush portion;
 wherein the handle includes; a grip portion to be held in a hand; a neck portion that is located between the grip portion and the brush hair attaching portion, and that supports the brush hair attaching portion and has a diameter smaller than that of the grip portion;   wherein the brush portion is formed in a mountain shape with the center of the brush hair portion in the longitudinal direction of the handle as the peak, and the grip portion has cross sections perpendicular to the longitudinal direction of the handle, the cross sections include triangular portions with the tip at the apex thereof.   
     
     
         2 . The toothbrush according to  claim 1 , wherein the grip portion has a shape in which the cross-sectional area gradually decreases toward the neck portion. 
     
     
         3 . The toothbrush according to  claim 1 , wherein the surface of at least a part of the grip portion is decorated. 
     
     
         4 . The toothbrush according to  claim 3 , wherein the neck portion and the brush hair attaching portion are integrally formed together, while the neck portion is detachable from the grip portion. 
     
     
         5 . The toothbrush according to  claim 3 , wherein the brush hair attaching portion is detachable from the neck portion. 
     
     
         6 . The toothbrush according to  claim 3 , wherein the decoration is a decoration lacquer. 
     
     
         7 . The toothbrush according to  claim 6 , wherein the neck portion and the brush hair attaching portion are integrally formed together, while the neck portion is detachable from the grip portion. 
     
     
         8 . The toothbrush according to  claim 6 , wherein the brush hair attaching portion is detachable from the neck portion. 
     
     
         9 . The toothbrush according to  claim 1 , wherein
 in the brush portion comprises: a central brush hair group in which a plurality of brush hair bundles are arranged along the longitudinal direction in the center of the brush hair portion; and a peripheral brush hair group in which a plurality of brush hair bundles are arranged to surround the central brush hair group in the brush hair portion,   the central brush hair group is taller than the peripheral brush hair group, and the central brush hair group and the peripheral brush hair group are formed in a mountain shape with the tip side sloping upward toward the back end and the neck side sloping downward toward the back end, and with the center of the brush hair attaching portion in the longitudinal direction as the dividing line.   
     
     
         10 . The toothbrush according to  claim 9 , wherein the number of brush hair bundles on the tip side of the peripheral hair bundle group is less than the number of hair bundles on the neck side. 
     
     
         11 . The toothbrush according to  claim 9 , wherein among the central hair bundle group and the peripheral hair bundle group, at least the hair of each hair bundle of the central hair bundle group is shaped to taper conically toward the tip. 
     
     
         12 . The toothbrush according to  claim 9 , wherein the hardness of the central hair bundle group and the peripheral hair bundle group are mutually different by varying the thickness or the amount of hair of the hair bundles.