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lectric toothbrushes

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Why do some electric toothbrushes cost only tens of yuan?
Why do some electric toothbrushes cost only tens of yuan?

2021-12-03

Why do some electric toothbrushes cost only tens of yuan?From a professional point of view, the cleaning ability of electric toothbrush is related to the vibration frequency and amplitude, which are related to the movement motor of electric toothbrush. However, the electric toothbrush which costs te
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