Toothbrush, handle has undulating bristle face, so that length and stiffness of bristles varies

摘要

A toothbrush 1 has a handle 2 with undulating bristle face 3. The bristle face has ridges 5 and troughs 7. The lengths of the bristles varies, with the shorter bristles being stiffer than the longer ones. The bristle ends may lie in plane C or may undulate in a pattern opposite to the undulations in the bristle face.