The electric toothbrush generates high-frequency vibration through the rapid rotation or vibration of the motor core, instantly decomposes the toothpaste into fine foam, and deeply cleans the gap between teeth. At the same time, the vibration of the brush hair can promote the blood circulation in the mouth and massage the gum tissue.

  In principle, electric toothbrushes can be divided into two categories: rotation and vibration. The principle of rotary toothbrushes is simple, which is that the electric motor drives the circular brush head to rotate, enhancing the friction effect while performing ordinary brushing actions. Rotary toothbrushes have a strong force, clean the tooth surface, and relatively weak cleaning between teeth. However, they have significant wear on teeth and are not recommended for long-term use.

  Vibration type toothbrushes are more complex and expensive. A vibration type toothbrush has an electrically driven vibration motor inside, which can cause the brush head to produce high-frequency oscillation perpendicular to the direction of the brush handle, but the amplitude of oscillation is very small, usually about 5 millimeters above and below, with the industry's largest oscillation being 6 millimeters.

  When brushing teeth, on the one hand, the high-frequency swinging brush head can efficiently complete the action of brushing teeth, and on the other hand, over 30000 vibrations per minute can also cause a large number of small bubbles in the mixture of toothpaste and water in the mouth. The pressure generated when the bubbles burst can penetrate deep into the teeth to clean dirt.