另一方面，硬毛牙刷刷，刷的积极可能导致经济衰退的牙龈和牙齿的珐琅质磨损，暴露根耦合表面。
On the other hand, a hard-bristled brush, coupled with vigorous brushing can result in recession of the gums and the abrasion of tooth enamel and exposed root surfaces.
假牙刷子的毛比普通牙刷的毛要硬一些。
A denture brush has bristles that are stiffer than those in an ordinary toothbrush.
别用硬毛牙刷。硬毛牙刷会伤害牙龈组织。
Use a hard bristle toothbrush as this can damage the soft tissues in the gums.
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