As a more traumatic type of operation in tooth extraction, there are indeed issues that need attention before extraction, as follows: 1. Before extraction, it is recommended that patients must eat, that is, eat, as extraction itself is an operation under local anesthesia, it is not like general anesthesia operation that requires patients not to eat for 6-8 hours before surgery, and if you do not eat before extraction, you are especially prone to fear and hypoglycemia during surgery, which leads to the phenomenon of syncope. 2. Before tooth extraction, patients should stop taking aspirin for one week and switch to other drugs, and actively treat hypertension and hyperglycemia, 180/100mmhg, 8.8mmol/L is absolutely contraindicated. 3. Women should avoid menstruation before tooth extraction, and the first three months and the second three months of pregnancy are absolutely contraindicated. 4. It is also recommended to do blood tests to exclude patients in a more serious state of infection, anemia or coagulation problems, which should be noted before tooth extraction.