There are some precautions and contraindications for wisdom tooth extraction, and the doctor should determine whether the wisdom tooth can be extracted. Wisdom teeth are the third molars of human beings and usually do not need to be extracted if they are intact and do not obstruct the normal growth of adjacent teeth, but wisdom teeth that cannot erupt by themselves and obstruct adjacent teeth need to be extracted. The cautions and contraindications for wisdom tooth extraction are as follows: 1. Wisdom tooth extraction is not recommended for people with hematologic diseases, as it may not be easy to stop bleeding due to wisdom tooth extraction; 2. Patients with kidney disease and liver disease need to be treated systematically before wisdom teeth can be extracted; 5. For long-term use of anticoagulant drugs such as heparin and aspirin, wisdom teeth can be extracted only after the coagulation function is restored; 6. Just after wisdom tooth extraction, patients should bite cotton balls for about half an hour to avoid continuous bleeding. 24 hours should not be spent on brushing and rinsing, avoiding chewing hard, not eating spicy and stimulating food, but eating soft, warm and cool liquid food, such as porridge and rice soup. Pay attention to rest and avoid fatigue to promote the recovery of the wound. For patients with large incisions and the presence of sutures, the sutures need to be removed 7 days after surgery according to medical advice.