Sonic electric toothbrush is more gentle, can better protect the enamel. The head of the sonic electric toothbrush comes in several shapes (flat, crescent-shaped, W-shaped). The crescent-shaped head fits the tooth surface well and effectively removes food debris from the tooth surface and between the teeth. Sonic electric toothbrush is less stimulating to the teeth, and it is also suitable for people with sensitive teeth. In addition, many acoustic electric toothbrushes have the effect of massaging gums and whitening teeth, which can effectively delay the aging and loosening of teeth.