Frequent biting of the tongue may be caused by dental abnormalities, nerve abnormalities, and malocclusion. 1. Dental abnormalities: Usually when the patient has dental abnormalities, it is easy to bite the tongue when eating. For example, if the patient has only decayed teeth and remaining crowns or missing teeth, if the upper teeth can not find the corresponding lower teeth when eating, the patient usually bites his/her tongue frequently. 2. Nerve abnormality: Some patients will bite their tongues unconsciously and to the same part every time, whether eating or sleeping, which indicates that the patient’s nerve is abnormal. 3. Malocclusion: If the patient eats too fast or talks while eating, he/she may bite the tongue accidentally. If the patient bites his tongue frequently, it may mean that the teeth are not biting well, usually the most common one is diastema. There are many reasons for frequent tongue biting, and patients are advised to actively seek medical attention and standardize treatment under the guidance of the doctor.