发明授权
US09578957B2 Toothbrush including a device for indicating brushing force 有权
牙刷包括用于指示刷牙力的装置

Toothbrush including a device for indicating brushing force
摘要:
A toothbrush that includes a piezochromic polymer or a proximity dye based polymer effective to emit an optical signal indicative of brushing force.
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