- 问题详情:Howfitareyourteeth?Areyoulazyaboutbrushingthem?Neverfear:Aninventorisonthecase.Anelectrictoothbrushsenseshowlongandhowwellyoubrush,anditletsyoutrackyourperformanceonyourphone.TheKolibreetoothbrushwasexhibitedattheInternationalConsumerElectron...
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