Wisdom tooth extraction can generally stop bleeding within 1-2 hours, and the blood exuding from the wound gradually forms a blood clot to cover the wound. If the wisdom tooth is removed during the process of cutting the gums, separating the soft tissues, grinding the alveolar bone and other large traumatic operations, the hemostasis time will be relatively delayed, and cold compresses can be applied in time to promote vasoconstriction, slow down the blood circulation and reduce the amount of blood exudation. If there is a large blood vessel rupture in the wound, it is necessary to immediately ligate, place gelatin sponge and other sutures to close the wound, and these measures can accelerate the clotting speed. Some patients who have been taking anticoagulant drugs such as aspirin for a long time may have their clotting time prolonged by about 2-3 hours, and can apply topical Yunnan Baiyao to promote the formation of blood clots.