Abstract: A toothbrush is provided that can easily and effectively remove dental plaque on molars in the deepest part of the mouth, in interdental spaces and on inner surfaces of teeth. The bristle tips form three brush surfaces. The first brush surfaces adjacent the free end of the brush extends upwardly from the free end to define a first bristle peak. The second brush surface extends downwardly from the first bristle peak toward the brush head. The third brush surface extends upwardly from the second brush surface to a second bristle peak adjacent to the attached end of the brush head. The second brush surface and the third brush surface intersect to form a bristle valley located below said first bristle peak and the second bristle peak. The toothbrush preferably comprises six to ten rows of bristle tufts.

Abstract: A toothbrush having a block head with bristles embedded in tuft holes by flat bars, a block handle for holding said toothbrush, and an elongated neck portion connecting said block head with said block handle, wherein said block head is at least 3 mm but at most 4 mm in thickness, the length from the bottoms of said tuft holes to a reverse surface of said block head is at least 0.2 mm but at most 2.2 mm, said tuft holes are 1.8 mm or more in depth and said toothbrush is formed of a polyacetal resin.