The seriousness of the big and small face may be caused by bad chewing habits, teeth alignment or jawbone development deformity, or may be caused by jawbone tumors, the specific need to clarify the cause, and then targeted treatment. 1. Bad chewing habit: If you have bad chewing habit, for example, you often chew food with one side of your teeth, which leads to one side of the biting muscle being developed, and thus the phenomenon of big and small face appears. In this case, you need to change the other side of the teeth to chew food, and to chew food on both sides for the patient, which will help to improve the situation, if necessary, you can go to the regular hospital for occlusal muscle excision surgery. 2. Teeth are not aligned: some people have teeth that are not aligned properly, and the bite relationship is not normal, so the phenomenon of big and small face can also occur, this situation can go to the regular hospital to do orthodontic treatment, and usually can be improved. 3. Jaw development deformity: If there is deformity in jaw development, it will also easily lead to large and small face, in this case, you can go to the hospital for surgical treatment, such as orthognathic surgery. 4. Tumor of jaw: if there is a tumor of jaw, it will easily lead to asymmetric size of both sides of the face, in this case, you need to go to the regular hospital for surgical resection treatment. It is recommended to go to the regular hospital to have a relevant examination to find out what causes the asymmetry, and then adopt corresponding solutions according to the situation.