The risks of tooth extraction for patients with liver dysfunction caused by various liver diseases exist mainly in the following aspects, and the level of risk mainly depends on the degree of liver dysfunction. 1. Some anti-inflammatory and analgesic drugs that may be used before and after tooth extraction are metabolized by the liver, thus increasing the burden on the liver and adverse drug reactions. 2. Patients with severe liver disease are often accompanied by coagulation dysfunction, and the risk of bleeding during and after tooth extraction is increased. 3.Patients with liver disease are prone to hypoglycemia due to impaired glycogen allogenesis, reduced insulin tolerance and reserve glycogen mobilization. 4. There is a risk of cross-infection between patients with infectious liver diseases such as hepatitis B and health care workers. Prevention of tooth extraction risk in patients with liver disease 1. Carefully inquire about the cause, staging, infection and severity of the patient’s liver disease. 2. Reduce the number of tooth extractions at one time, thus avoiding the use of antibacterial drugs as much as possible; when the use of antibacterial and analgesic drugs cannot be avoided, special attention should be paid to the selection of drugs and avoid the use of drugs metabolized by the liver, such as nitroimidazole antibacterial drugs such as metronidazole, glycopeptide antibacterial drugs such as vancomycin and non-steroidal anti-inflammatory drugs such as loxoprofen sodium. The use of Lincomycin and other Lincoamides antibacterial drugs is prudent in those with hepatic insufficiency. In addition, the dosage of drugs should be controlled to avoid increasing the burden on the liver and the adverse effects of drugs. 3.Check liver function, blood routine and coagulation function to grasp the degree of liver function damage and whether there is anemia and coagulation dysfunction. 4. Blood glucose testing should also be performed for those with severe liver function damage. 5. Treatment of tooth extraction: Different treatment methods are adopted according to the severity of coagulation dysfunction of the patient. If the patient appears pale, chest tightness, shortness of breath and other systemic symptoms during the operation, immediately stop the tooth extraction operation, give the patient oxygen in time, establish intravenous access, continuously monitor the patient’s oxygen saturation, blood pressure, heart rate and other vital signs, and decide whether it is necessary to elective according to the operation process and the patient’s recovery. To perform tooth extraction. 6.Take measures to reduce anxiety, but avoid using benzodiazepines because they can aggravate liver function damage. 7.For patients with portal hypertension, blood pressure should be monitored intraoperatively; at the same time, because portal hypertension is often accompanied by elevated adrenaline, the use of local anesthetics containing adrenaline should be minimized to avoid aggravating the symptoms of portal hypertension. 8. Ensure four-handed operation, that is, the assistant uses a metal suction device to suck out the blood in the patient’s mouth in time, so as to avoid the patient swallowing a large amount of blood. Because the metabolic capacity of nitrogen in the patient’s blood is reduced, the swallowed blood cannot be detoxified or cleared by the liver and enters the body circulation through the collateral circulation, and can cause central nervous system dysfunction through the blood-brain barrier.