An electric toothbrush is a toothbrush which automatically creates rapid bristle movements using oscillation motions to imitate hand brushing. Electric toothbrushes can be classified according to the frequency of their movements as power, sonic, or ultrasonic toothbrushes, depending on whether they make movements below, in, or above the audible range, respectively.
An electric toothbrush is a toothbrush which automatically creates rapid bristle movements using oscillation motions to imitate hand brushing. Electric toothbrushes can be classified according to the frequency of their movements as power, sonic, or ultrasonic toothbrushes, depending on whether they make movements below, in, or above the audible range, respectively.
Source: Wikipedia "Electric toothbrush" · CC BY-SA 4.0
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