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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This young male, buried at a prehistoric site in Central Sudan, probably munched on the roots of a plant called purple nutsedge. Donatella Usai/Centro Studi Sudanesi and Sub-Sahariani hide caption

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This Dirty Little Weed May Have Cleaned Up Ancient Teeth

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