Unnervingly futuristic, these bulky, high-tech toothbrushes promise to scrub your choppers thoroughly in 20 seconds. WSJ: Dentists like Dr. Lana Rozenberg are overly familiar with two eternal fibs: that their clients floss regularly, and that they brush their teeth for at least two minutes twice a day. "Most people don’t brush their teeth for two minutes," said the Manhattan-based industry veteran. "Thirty seconds is more like it," or under a second for each of their 32 teeth. But what if, in those 30 seconds, a device could reach the front, back and sides of every tooth at once? That’s the proposition of new "whole mouth" toothbrushes, which rely on vibration and a preponderance of bristles packed inside a structure resembling a mouthguard to deliver an up-to-snuff scrubbing in as little as 20 seconds — 10 each for top and bottom sets of teeth. "It helps make things way faster, way easier and feels a little more guaranteed because you actually feel it on each one of your teeth," said Kristopher Paul, a medical-transportation driver in St. Petersburg, Fla., who has bit down on a 360 Sonic Brush Pro ($70) each morning for the past year. Mr. Paul, 36, also likes the tool’s 15-minute whitening mode, which combines a blue LED light and whitening gel to fade bothersome coffee stains.
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