| 摘要 |
This invention relates to the tooth-brush that has two brush heads. One brush head has a concave brush surface and the other a convex brush surface. This invention provides a tooth-brush that can wash teeth efficiently and that is cheap, convenient, with replaceable brush heads. The characteristics are as follow; i) the brush heads are an the both ends of the brush grie; ii)in use, the concave brush better fits to the outer side of the teeth while the convex one fits to the inner confour curve for effective brushing.
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