A slightly convex upper lip from side view is related to malocclusion, protruding upper jaw, concave base of the nose, or shortage of chin, etc. It can be improved by orthodontics, convexity correction, and medical aesthetic techniques. 1. Malocclusion: A slightly convex upper lip from the side may be caused by malocclusion, such as deep overjet upper jaw protrusion, which requires orthodontic treatment. 2. Convexity of the upper jaw: the upper lip may be slightly convex from the side, which is of bony origin, and needs to be corrected by orthognathic surgery, orthodontic treatment and comprehensive treatment program. 3. Nasal base depression or chin shortage: the upper lip may be slightly convex from the side, which may be caused by nasal base depression or chin shortage, and need to be improved by medical cosmetic techniques, such as filling the nasal base, chin filling, and so on. Patients who are dissatisfied with their upper lip and wish to improve it are advised to go to a regular hospital and be evaluated by a specialist for an appropriate treatment plan.