I often tell my students that there are many links in the operation of tooth extraction, just like a necklace, each link is very important, as the saying goes, one wrong move is a total loss, and if there is a problem, it is like the necklace is broken and falls off. 1. pre-operative examination to determine the teeth to be extracted; 2. pre-operative judgment of the whole body condition and the necessary to laboratory tests, such as blood routine, liver function, etc., please inform the doctor if there is a physical examination; 3. pre-operative preparation, the doctor’s surgery schedule, the patient’s appointment time, the necessary sleep the night before, if you stay up late, you need to make another appointment time, and you can eat and drink before the operation; 4. preparation of sterilization items by doctors and nurses instruments and anesthesia drugs; 5. Disinfection; 6. Anesthesia; 7. Technical operation of surgery; 8. Individualization and treatment of unexpected situations; 9. Wound treatment, necessary sutures to close the wound; 10. Postoperative medical advice, oral antibiotics and painkillers, time for compression of cotton rolls in the extraction area; 11. Countermeasures for postoperative wound bleeding; 12. Necessary follow-up consultation.