Which diseases should not be extracted teeth extraction for healthy people, and will not have adverse effects, it will not bring danger. However, when suffering from certain diseases, or because the patient conceals the condition for the purpose of tooth extraction, tooth extraction will bring many harms, and even life-threatening. In order to avoid the occurrence of accidental tooth extraction, it is best not to extract teeth in the following situations: Blood system diseases All patients with coagulation disorders, such as hemophilia, aplastic anemia, thrombocytopenic purpura, leukemia, etc., may be affected by tooth extraction. Bleeding caused more than, and even life-threatening, it should generally avoid tooth extraction. Cardiovascular system diseases All patients with high blood pressure and heart disease should understand the nature and severity of their diseases before tooth extraction, and tooth extraction should not be performed during the attack of the disease. People with mild hypertension can usually have their teeth extracted. Moderate, such as the elderly, the systolic blood pressure is 22~24KPa (170~180mmHg)