Having non-rotten teeth is one of life’s little pleasures that few are willing to give up. But what does a $400+ smart toothbrush offer that a $3 dumb one doesn’t? @alicedkc.https://www.smh.com.au/technology/how-smart-does-a-toothbrush-need-to-be-20200206-p53y9p.html …
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