Most studies of flossing have been too short to prove the daily practice has long-term health benefits, some dentists say. But conclusive studies aren't cheap or easy. Klaus Vedfelt/Getty Images hide caption

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Does Flossing Help Or Not? The Evidence Is Mixed At Best

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The MD Brush has an unusual grip that automatically angles the brush head at 45 degrees. Meredith Rizzo/NPR hide caption

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Build A Toothbrush, Change The World. Or Not

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