1. When people with acute infectious diseases are in the acute phase, they should wait until their condition is stable before performing dental surgery.

2. During the acute inflammation period of oral local soft tissue, orthodontic treatment should be carried out after the inflammation is restored to avoid the aggravation of local infection caused by inflammation.

3, suffering from hemorrhagic coagulation dysfunction.

4. Suffering from active angina pectoris, which has not been controlled recently.

5, suffering from malignant tumors of the gums.