Relative contraindications to tooth extraction should be excluded prior to extraction, as well as proper regulation of systemic systemic diseases, and protection of blood clots should be observed after tooth extraction as follows. 1. Before tooth extraction: (1) Excluding relative contraindications to tooth extraction: for patients suffering from heart disease, hypertension, diabetes mellitus, liver and kidney diseases, hematopoietic system diseases, as well as patients in pregnancy, menstruation, and acute infections, it is necessary to make clear whether their own physical condition and period of illness can tolerate tooth extraction. (2) Appropriate regulation of systemic diseases: When performing tooth extraction, appropriate specialists should be involved, and blood pressure and heart rate can be temporarily adjusted before the start of the procedure. 2. After tooth extraction: pay attention to the protection of blood clot, don’t brush or rinse your mouth within 24 hours after tooth extraction, don’t suck the wound, avoid using the side of tooth extraction to chew food.