What the world needs now is a Web-enabled toothbrush.That part is clear to several oral-hygiene companies. What they can’t agree on is who was first to put teeth into the smartphone.The giant Procter & Gamble Co. last week demonstrated what it calls the “World’s First Available Interactive Electric Toothbrush.” It links with a smartphone and records brushing habits, while an app gives mouth-care tips alongside news headlines.
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