toothbrush with bristle height gradually decreasing towards the longitudinal axis of the head of the toothbrush.

摘要

Toothbrush in which the height of the bristles, present on its head, decreases progressively, from its lateral edges (2,2') towards the longitudinal axis, with the result that the free tips of the bristles form an elongated hollow (3), which runs parallel to the longitudinal axis of the head. IMAGE IMAGE