Toothbrush

Abstract

To provide a toothbrush having fully workable long bristles on the top end for easily brushing even a comparatively flat face without making a hardly hit part and without up-and-down movement influenced by recessions and projections of bristle bunches on the rear side, all of the bristle bunches on the rear side comprise mixed bristle bunches of long and short bristles, lines connecting respectively bristle top ends of the long and the short bristles are approximately parallel to a flat planting surface on the rear side, and an effective height of main bristles on the top end of the head is higher 1 mm or more than the height of the line connecting the bristle top ends of the short bristles on the rear end, and is higher than the height of the line connecting the bristle top ends of the long bristles on the rear end.

1 . A toothbrush comprising a head ( 1 ), where a plurality of bristle bunches made by bunching a plurality of bristles are planted on a planting surface, a neck and a handle in this order, 
 wherein, when the head ( 1 ) is seen in the lateral direction, all of the bristle bunches on the rear side ( 1   b ) comprise mixed bristle bunches of long bristles ( 2   a ) and short bristles ( 2   b ),    lines ( 2 A,  2 B) connecting respectively bristle top ends of said long bristles ( 2   a ) and said short bristles ( 2   b ) respectively are approximately parallel to a planting surface ( 3 B) having a straight line on the rear side ( 1   b ), and    an effective height ( 1 A) of main bristles on the top end ( 1   a ) of the head ( 1 ) is higher by 1 mm or more than a height of the line ( 2 B) connecting the bristle top ends of the short bristles ( 2   b ) on the rear side ( 1   b ), and is higher than a height of the line ( 2 A) connecting the bristle top ends of the long bristles ( 2   a ).    
   
   
       2 . The toothbrush according to  claim 1 , wherein the difference of the height of the lines ( 2 A,  2 B) connecting respectively the top ends of the long bristles ( 2   a ) and the short bristles ( 2   b ) on the rear side ( 1   b ) is 1 to 5 mm.