Lip muscle training, surgery, orthodontic treatment and other methods can be carried out to improve the mouth convex upper lip curvature. 1. Lip muscle training: If the lips are too tight, you can do lip muscle training such as pursing your lips frequently. 2. Surgical treatment: The main procedure is to lengthen the upper lip. The surgical method is to make an incision on the base of the nose, and achieve the effect of lengthening through the tissue sagging suture. 3. Orthodontic treatment: The protruding upper lip may also be associated with maxillary protrusion and tooth protrusion, which can be treated with orthodontic treatment and, if necessary, with orthognathic surgery. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.