The "electric" toothbrush of one hundred years ago.
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D003742:Dental Devices, Home Care / Q000266:history*; D004560:Electricity / Q000266:history; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011781:Quackery / Q000266:history*; D014481:United States