How to classify electric toothbrushes

How to classify electric toothbrushes?
Electric toothbrushes are divided into two types: plug-in power supply and battery-driven. Compared with the traditional manual toothbrush, the electric toothbrush is driven by electric power, and the brush head moves at a speed of several thousand times or even tens of thousands of times per minute. The efficiency is much higher than that of the manual toothbrush, but it also has higher requirements on the bristles. Damage to the gums during brushing.
Electric toothbrushes are divided into many types according to the improvement of technology. Generally, the teeth are cleaned by vibration rotation, and some high-grade ultrasonic instruments are used to clean teeth by pulse and water spray.