Smiling with exposed gums may be due to crown shortening, excessive upper lip movement, maxillary bone overgrowth, etc. If smiling with exposed gums is more than 2mm, which affects the aesthetics, the treatment mainly includes crown lengthening, muscle paralysis, orthognathic treatment, etc. for treatment. 1. Crown lengthening: If the crown is short and causes exposed gums, crown lengthening can be performed to make the clinical crown longer. 2. Muscle paralysis: Generally, muscle paralysis is performed by injecting muscle paralyzing agents such as botulinum toxin to limit the mobility of the upper lip. 3. Orthognathic treatment: Surgery to improve maxillary overgrowth. There may also be other reasons for the smile and gums, 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.