1, to ensure good health, no important organic diseases, such as heart disease, hepatitis, nephritis, pneumonia and other diseases, no source of oral infection.

2. Quit smoking and drinking before operation 1 week to prevent colds and respiratory infections.

3. Eat more foods or fruits rich in vitamins before operation, and eat less spicy and irritating foods.

4, oral sedatives can be taken one night before surgery to ensure adequate sleep.

5. Women should avoid menstrual period.