1. It is necessary. Since the toothbrush is in contact with the teeth and gums, the food residues in the mouth will enter the toothbrush, and the toothbrush is generally placed in the humid toilet, which provides superior conditions for the propagation of bacteria.
2. Since the oral cavity is in a humid and dark environment for a long time, it is very easy to breed various bacteria. In particular, when multiple toothbrushes share a toothpaste, it is more likely to cause cross infection and cause harm to our health.
