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An electric toothbrush is a toothbrush that makes rapid, automatic bristle motions, either back-and-forth oscillation or rotation-oscillation (where the brush heads alternates clockwise and counterclockwise rotation), in order to clean teeth. Motions at sonic speeds or below are made by a motor. In the case of ultrasonic toothbrushes, ultrasonic motions are produced by a piezoelectric crystal. A modern electric toothbrush is usually powered by a rechargeable battery, which is charged through inductive charging when the brush sits in the charging base between uses.