First of all, the first reason may be that there is a little problem in the mouth. When we are angry, our lips or the inside of our mouth will swell, and it is easy to touch our teeth, so we accidentally bite them. Other oral diseases or inflammation can also cause similar situations. If you happen to feel this way, you'd better go to the hospital for timely and appropriate anti-inflammation. Take more vitamins on weekdays, eat more fruits and vegetables and drink more boiled water to keep healthy.
Secondly, the second reason is mental state. When we are distracted, we often forget what we are doing. Just like when a person is on the phone, anyone who puts something into his arms may catch it inadvertently. The reasons are the same. When we don't concentrate when eating or talking, and think about other things, we will ignore our own behavior and finally bite our teeth on our cheeks. This is actually normal.
In fact, even obesity can lead to this situation. When a person's weight suddenly increases, the body fat will change subtly and the original cheek fat will become thicker. When the teeth are not used to this change, they will naturally repeat the previous occlusion action and bite the swollen cheek muscles. So in daily life, we should also pay attention to diet, don't overeat, don't overeat.