A 4 year old child with exposed gums may have a deep overjet or hyperfunctioning upper lip muscles, resulting in exposed gums, which can be corrected in different ways for different conditions. 1. Deep overjaw: braces can be used to correct the symptoms of exposed gums and correct the disordered occlusal relationship. However, orthodontic treatment can only improve mild and moderate gum exposure. If the symptoms are more severe, orthodontic treatment, combined with orthognathic surgery, can be chosen. Good oral hygiene is needed after surgery to promote wound healing. 2. Upper lip muscle hyperfunction: Botulinum toxin can be injected under doctor’s guidance to alleviate the symptoms, but Botulinum toxin has a shorter maintenance time and regular injections are needed. With age, the elasticity of the skin decreases, and the symptoms of exposed gums are reduced accordingly. If a 4-year-old child has exposed gums, it is recommended to go to the hospital stomatology department in time, cooperate with the doctor’s examination, early treatment and early correction. After correction, the diet should be light, pay attention to rest, can strengthen the calcium, eat more eggs or shellfish, bone food. The use of drugs need to follow the doctor’s advice.