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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No-Drill Dentistry: Fluoride Treatments Can Prevent Cavities In Adults

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Demonstrator China Starshine holds up signs outside of City Hall in Portland last week. Ross William Hamilton/The Oregonian/AP hide caption

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Portland, Ore., Becomes Latest Fluoride Battleground

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