Red lips and white teeth are classic words to describe beautiful women. Although grinning is not a big problem, it will make people look unclean. The standard aesthetic feeling is that the ratio of the distance from the tip of the nose to the upper lip to the distance from the lower lip to the lower jaw is 3: 5, and there are not a few people with inappropriate ratio. Gum smile means that when people laugh or laugh between laughter, the maxillary teeth and gums are completely exposed. It is caused by many reasons, such as maxillary protrusion, tooth deformity, short upper lip tissue and strong upper lip quadratus muscle strength. In order to solve the problem of laughing and exposing gums, maxillary protrusion can be corrected by maxillary deformity, but this operation has some shortcomings such as big trauma, long recovery time and certain risks, and it needs experienced professional plastic surgeons in regular hospitals to ensure that the operation is foolproof. For patients with strong labial muscle strength, an incision is made in the maxillary vestibular sulcus to find out the labial muscles on both sides, cut off this muscle and relax the upper lip, but the patient still needs to do lip functional exercise after operation. Tooth deformity can be corrected by orthodontic treatment for 6 months to 1 year. If the upper lip is too short, local flap transfer can be used to increase the height of the upper lip. However, this operation will leave a scar on the bottom of the upper lip and nose, and the patient should be locally braked after operation to prevent scar hyperplasia.