Our daily thread. Dental floss is a great underappreciated invention.
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Malvin E
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D003731:Dental Caries / Q000266:history / Q000517:prevention & control; D003742:Dental Devices, Home Care / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D014481:United States