A redesigned brush head on the Oral-B iO is just one of its improvements. Photo: Proctor & Gamble It’s easy to mock smart toothbrushes, but most people don’t have very good dental hygiene. High-tech ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Future There hasn't ...