The working principle of the electric toothbrush is that the motor drives the circular brush head to rotate, which strengthens the friction effect while performing the ordinary brushing action. The slight vibration caused by the high-speed rotation of the electric toothbrush not only improves blood circulation in the mouth, but also has an unexpected massaging effect on the gum tissue.
In the process of working, the acoustic electric toothbrush mainly relies on the operation of the micro motor in the toothbrush to drive the toothbrush head to start to swing at high speed from left to right, and the toothbrush head will produce mechanical vibration in the process of movement, that is, sound waves. Acoustic waves generated by electric toothbrushes during operation have different cleaning effects on teeth due to their different frequencies. In general, the cleaning effect of a sonic toothbrush is directly proportional to the frequency and amplitude of the acoustic wave.
The rotary electric toothbrush mainly uses the motor inside the toothbrush to drive the circular brush head to rotate, which can strengthen the friction effect of the toothbrush on the teeth while performing the action of the ordinary toothbrush. Compared with the acoustic electric toothbrush, the rotary toothbrush has a lower price and relatively simple working principle. 
