Gummy smile is a common manifestation. There are three causes: short crowns on the upper front teeth, excessive movement of the upper lip muscles, and abnormal development of the upper jaw. The treatments are crown lengthening, Botox injections and orthognathic surgery, respectively. One method does not solve all problems: However, if surgery is not acceptable, consider Botox injection alone for improvement. a matter of 1 minute or less, 1-4 units of Botox on one side (very small amount). Case 1: Before injection Case 1: After injection