Always biting the lip is a very bad oral habit, easy to lead to the upper front teeth protruding outward, the lower front teeth inward, resulting in open jaw, but also easy to lead to traumatic ulcers on the lips, or mucous gland cysts on the lower lip. Lip biting it is mainly a psychological disease, most likely caused by the patient’s lack of security, or mental stress, improper rest. Patients must deliberately quit this bad habit, you can also let the oral surgeon, to help you wear a certain tool in the oral cavity, to stop us from biting the lips of the improper action, in the lip biting quit, but also timely correction of dental disorders and deformities, to avoid excessive protrusion of the teeth, affecting the aesthetics, and the open jaw is likely to be on the back teeth caused by the pressure of the rear teeth, resulting in the occurrence of the fracture of the back teeth.