I. Psychological preparation At present, there are two kinds of misconceptions about surgical extraction of obstructed teeth: one is overly contemptuous, thinking that there is nothing great about extracting a tooth, that one’s body is good enough to go to work without medication or injections, and will be fine in a day or two, going to work as usual, physical exercise, and even drinking what one wants to eat, with heavier post-operative reactions such as pain and swelling, thus producing heavier psychological contrasts; the other is over-exaggerating the ideological The other is to over-exaggerate the complexity, difficulty and pain of the operation, generating a sense of fear to the extent that they undergo tooth extraction surgery under extreme tension and anxiety, which is not conducive to the smooth operation and the healing of the postoperative wound. Both cases are caused by the lack of adequate understanding of the tooth extraction surgery. If nervousness and fear of tooth extraction surgery is a common psychological state, one should fully consult with the doctor before extraction to understand the procedure, possible intraoperative and postoperative reactions, etc. To have a full understanding of the whole treatment process and to have a good idea of what to expect will help to eliminate nervousness and fear and to arrange work and life reasonably after the surgery. Physical preparation 1. If you have any systemic diseases, you should be treated in the relevant department and undergo tooth extraction surgery after your condition is stabilized, and you should explain your condition to the extraction doctor before the extraction so that you can take emergency measures under extraordinary circumstances. 2. Women should not have their teeth extracted during menstruation to avoid the formation of compensatory bleeding. 3. Patients treated with anticoagulant drugs should have their teeth extracted 3-5 days after stopping the drugs. 4. Patients with hypertension should have their blood pressure controlled at <140/90 and should also undergo surgery when they feel well. 5. Wisdom tooth extraction should not be performed after poor sleep or excessive fatigue. Extraction should be performed with adequate rest and sleep. 6. You should not undergo tooth extraction surgery when you are in a bad mood, and you should adjust your mood and then have your tooth extracted. 7. The tooth cannot be extracted when intense physical or mental work is still required the day after the operation