In general, diabetes, blood disease, acute hepatitis and other diseases can not be extracted. 1. Uncontrolled diabetes mellitus: uncontrolled diabetes mellitus patients have low coagulation function and poor resistance to infection, tooth extraction may lead to bleeding, infection aggravation and worsening of the condition. 2. Blood disease: patients suffering from leukemia, aplastic anemia, pernicious anemia, hemophilia and other blood diseases can’t have their teeth extracted, which will easily lead to lack of coagulation factors and cause hemorrhage, resulting in serious consequences and health hazards. 3. Acute hepatitis: if the patient in acute hepatitis during the extraction of teeth will appear blood flow, resulting in local hematoma, affecting the wound healing after extraction. Specific circumstances also need to consult the doctor in the hospital, the doctor to determine whether it can be extracted, and at the same time should go to the regular institutions for extraction treatment, to avoid serious consequences.