Abstract
An ultrasonic motor drives the small head of a recently developed toothbrush. In two preliminary experiments, participating patients, including a mentally retarded individual, were able to remove plaque from their teeth effectively and efficiently. The effectiveness of the ultrasonic toothbrush is shown with use of pictures of the oral health status of a patient before a prophylaxis, after she had used the ultrasonic device for two weeks, and then after she had brushed with a hand toothbrush for two weeks.
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