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Electric toothbrush 2016-06-02
The first electric toothbrush, the Broxodent, was invented in Switzerland in 1954 by 2016-06-02
Ultrasonic toothbrush，Main article: Ultrasonic toothbrush 2016-06-02
Electric brushes can be classified into two categories according to the type of actio 2016-06-02
Power source and charging 2016-06-02