1, the patient and the doctor should have a comprehensive and in-depth conversation to understand, and the doctor should understand the patient's face, the motivation of maxillary protrusion plastic surgery and whether the expectation of maxillary protrusion plastic surgery is realistic.

2. Maxillary protrusion plastic surgery cannot be performed because of possible internal diseases such as heart, lung, liver and blood, previous surgical history, medication history and allergic history.

3. Stop drinking one week before the operation and stop taking aspirin and other drugs.

4. Wash your hair once a day 3 days before maxillary protrusion surgery; Use sedatives and painkillers as appropriate half an hour before surgery.