Tooth extraction is a minor procedure in an oral clinic, and many people have had the taste of tooth extraction. Although tooth extraction is a minor surgery, it can cause a lot of trouble and even life threatening if not taken care of. Therefore, it is more important to understand the contraindications of tooth extraction. 1, habitual miscarriage is prohibited: tooth extraction during pregnancy is likely to cause miscarriage, especially habitual miscarriage. 2. Avoid tooth extraction during menstruation: tooth extraction during menstruation can cause excessive menstrual blood, resulting in non-physiological blood loss. 3. Pregnant women should not have their teeth extracted: tooth extraction in the third month of pregnancy can cause miscarriage, and tooth extraction in the eighth month of pregnancy can cause premature birth. 4. Patients with cirrhosis of the liver and chronic hepatitis should not have their teeth extracted: these people have a tendency to bleed, and tooth extraction may cause more than bleeding. 5. Diabetic patients should not have their teeth extracted: as their resistance to germs is generally reduced, tooth extraction can easily lead to various infections and aggravate their condition. 6. Cardiac patients should not have their teeth extracted: because of the patient’s fear of tooth extraction and nervousness when extracting, coupled with the pulling and painful stimulation during tooth extraction, the patient may die suddenly at any time due to cardiovascular accidents. 7. Avoid tooth extraction during acute infectious diseases: acute hepatitis, active tuberculosis, measles, epidemic hemorrhagic fever and various acute inflammatory periods. Tooth extraction is prone to postoperative infection and inflammation spread, so avoid tooth extraction before the disease is healed. 8. Patients with hematological diseases should not have their teeth extracted: patients suffering from leukemia, aplastic anemia, pernicious anemia, hemophilia, primary thrombocytopenic purpura, such as tooth extraction, can cause severe hemorrhage and endanger their lives due to the lack of coagulation factors and coagulation function.