To provide a toothbrush which provides the excellent advanceability of the brush into interdentium and periodontal pockets and brushability, does not damage gum, has adequate bristle stiffness and has a high brushing effect and brushing realization. 刷毛の歯間や歯周ポケットへの進入性と刷掃性に優れ、歯肉を傷めずにしかも適度な毛腰の強さを備え、刷掃効果と刷掃実感の高い歯ブラシを提供する。 - 特許庁