The blood can not be stopped after tooth extraction may be caused by too much trauma, or the existence of high blood pressure, coagulation function abnormalities, etc. According to the situation, choose to sew the wound, medication, blood transfusion and other methods to improve. 1. Excessive trauma: the trauma of tooth extraction is relatively large and not taken in time to stop bleeding by compression, which will lead to the blood can not be stopped, this situation needs to be sutured wounds, avoiding strenuous exercise, to prevent the suture line collapse. 2. High blood pressure: hypertensive patients are prone to vascular damage during tooth extraction, resulting in blood can not be stopped, in this case it is best to fill the extraction socket with sterile cotton balls and bite tightly, and with oral antihypertensive drugs, such as nifedipine, captopril and so on. 3. Abnormal coagulation function: when there is leukemia, thrombocytopenia and other diseases, due to abnormal coagulation function, after tooth extraction will lead to blood can not be stopped, immediately on the wound suture, clear cause of coagulation dysfunction and active treatment, if necessary, to take the transfusion to improve the coagulation function. After the extraction of the blood can not be stopped in a timely manner to the hospital, after the cause of the disease is clear and active treatment, so as to avoid excessive blood loss caused by shock and other complications. Medications should be used in accordance with medical advice.