Before operation 1 and 12 hours, water was fasted to prepare for operation under intravenous anesthesia.

2. Thoroughly disinfect the oral cavity and inject drugs that constrict blood vessels from the oral submucosa.

3. Cut about 2 cm from the injection port to separate the bone from the upper soft tissue.

4. Cut off the prominent mandibular angle and take out the bone.

5. Suture the wound after disinfection.

6. Wrap it up for about 1 week, and stay longer if there is more bleeding.

Through the above understanding, we have a clear understanding of the swelling time of mandibular surgery. I would like to remind everyone that after mandibular surgery, we must strengthen nursing. Nursing is the key to successful operation.