PROBLEM TO BE SOLVED: To provide a toothbrush that enables bristles to be properly inserted among teeth when toothbrushing is performed by moving the toothbrush in its longitudinal direction.SOLUTION: A toothbrush includes an inside bristle bundle group 4a which is arranged almost in the center of a head part 3, and outside bristle bundle groups 4b that are arranged on both the outsides of the inside bristle bundle group 4a, respectively. The inside bristle bundle group 4a has a long bristle bundle 42 which is higher than an outside bristle bundle 44 constituting the outside bristle bundle group 4b and which is twisted in a length direction.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】歯ブラシをその長手方向に動かして歯磨きをした際に、歯間に用毛を良好に挿入することができる歯ブラシを提供する。【解決手段】歯ブラシは、ヘッド部3の略中央に配置される内側毛束群4aと、内側毛束群4aの両外側に配置される外側毛束群4bとを備えた歯ブラシであって、内側毛束群4aは、外側毛束群4bを構成する外側毛束44の背丈よりも高く、長さ方向にねじれた長尺毛束42を有する。【選択図】図2
