When we hear about tooth extraction, we not only get a little creeped out. I believe that most people are psychologically afraid of tooth extraction. Although tooth extraction is a choice of last resort, but the need for tooth extraction, but also need to meet certain physical conditions. If there are the following contraindications, is the need to suspend or stop the extraction: 1, hypertensive patients, mainly for patients with blood pressure higher than 180/100mmHg, if lower than this range of hypertension patients, or can be extracted. 2, heart disease patients, heart attack and other heart problems in the last six months, some cardiovascular disease such as the need to take some anticoagulant drugs, need to stop anticoagulant drugs or find alternative drugs before tooth extraction. 3, there are serious diabetes, blood sugar more than 8.8mmol / l, these cases are best not to extract teeth. 4, kidney disease, acute nephritis, chronic renal insufficiency, severe kidney disease renal failure patients. 5, blood disease patients, bleeding tendency of blood disease patients should not extract teeth. 6.Patients with open stage of tuberculosis. 7, women during menstruation, tooth extraction during this period is likely to cause compensatory bleeding. 8, patients with liver disease and severe hepatitis can not extract teeth. 9, malignant tumors. Patients with malignant tumors, such as teeth located in malignant tumors or have been involved by the tumor, simple tooth extraction may provoke the tumor to cause proliferation, should be regarded as a contraindication. 10.Pregnant women in the first and last trimester of pregnancy should not be extracted. Avoid causing preterm labor and miscarriage. 11.Patients with acute inflammatory period and uncontrolled inflammation. 12, the main reason why patients with mental illness can not be extracted, is that these patients are often unable to cooperate with the doctor, which brings trouble to the extraction. 13, patients with adrenocortical insufficiency. 14, in the empty stomach, excessive fatigue, high mental tension, female menstruation and other circumstances, can not be extracted.