Smart toothbrushes have been around for a few years now, but they haven’t quite caught on. Sure, they promise better habits via connected sensors, but they also tend to be very expensive ($100 and up) ...

Earlier this year, Colgate released a connected toothbrush, an artificially intelligent mouth cleaner that would be sold at Apple Stores for $100 a pop. It looks like most electric toothbrushes: thick ...