Maxillary protrusion with exposed gums can be treated by maxillary anterior osteotomy, crown lengthening or orthodontics, as follows. 1. Maxillary anterior osteotomy: Bilateral first or second premolar teeth are extracted before or during the operation, osteotomy is performed at the gap between the teeth, and the soft tissue on the palatal side is used as the tip to move the bone backward or upward, and then it is refixed afterward in order to correct the maxillary protrusion. 2. Crown lengthening: Surgically lowering the position of the alveolar bone and the gingival margin, so that the healthy tooth structure originally located below the gums is exposed above the gums, and lengthening the clinical crowns to solve the problem of exposed gums. 3. Orthodontics: Orthodontics can solve the problem of gingival smile by depressing the front teeth, but the effect of using orthodontics for maxillary protrusion is not good, and joint orthognathic surgery is needed. It is recommended to go to a regular medical institution for professional treatment with the help of a doctor.