USA Today reports on a new line of toothbrushes that play music while you brush: The brush, in development for two years, will come in 18 varieties, each with a different two-minute song clip — the amount of time dentists recommend for a good brushing — from a popular artist. When the user pushes a button on the manual toothbrush, it "plays" a song. As the bristles are brushed across the teeth, they send sound waves …
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