Contraindications to tooth extraction should not be determined by age, but by the patient’s physical condition. Usually tooth extraction is not recommended for patients with blood diseases, heart disease, cirrhosis and chronic hepatitis, and during acute infectious disease episodes. 1. Patients with blood diseases: patients suffering from leukemia, aplastic anemia, hemophilia, and primary thrombocytopenic purpura, due to the lack of coagulation factors and coagulation dysfunction, tooth extraction can cause severe hemorrhage and life-threatening. 2. Patients with heart disease and high blood pressure: patients are afraid of tooth extraction, tense when extracting teeth, the pulling and pain of tooth extraction will stimulate the patients, and the patients may have cardiovascular accidents and sudden death. Uncontrolled high blood pressure will lead to obvious postoperative bleeding. 3. Cirrhosis of the liver and chronic hepatitis: these patients have a tendency to bleed and may bleed more than once after tooth extraction. 4. During the attack of acute infectious diseases: patients with acute hepatitis, active tuberculosis and other acute infectious diseases are prone to postoperative infections and inflammation spreading after tooth extraction, so they should be cured of the original disease first and then extracted. Whether the elderly can be extracted, as well as the precautions for tooth extraction, it is recommended to go to the hospital, according to the professional doctor’s judgment and guidance for tooth extraction.