Methods to improve maxillary protrusion include the use of functional orthodontic appliances and combined orthodontic-orthognathic treatment. Specific treatment measures should be chosen according to the patient’s age and severity of the condition. 1. Functional Orthodontic Appliances: For patients with mild to moderate maxillary protrusion, movable orthodontic appliances and fixed orthodontic appliances are usually used for correction. The movable orthodontic appliance can inhibit the development of maxilla and promote the forward growth of mandible, which is often applied to the children in the period of tooth replacement; the fixed orthodontic appliance is usually used after the extraction of teeth, which can play a role in the effect of internalizing the upper anterior teeth, and is applicable to the patients whose teeth are already in the period of permanent teeth. 2. Orthodontic-orthognathic joint treatment: For patients with severe maxillary protrusion, orthodontic-orthognathic joint treatment is usually adopted. Firstly, orthodontic treatment is carried out to correct the occlusal relationship of the teeth to a more appropriate position and then orthognathic treatment is carried out. It is recommended that patients with protruding maxilla should go to the hospital in time for follow-up treatment under the guidance of a specialist.