Half an hour after tooth extraction, spitting out the compressed cotton roll, if there is still obvious bleeding, it is called post-extraction bleeding. The majority of post-extraction bleeding is caused by local factors, and a few are caused by systemic factors. However, no matter what causes the bleeding, we should first pay attention to the patient’s systemic condition, ask about the bleeding, estimate the bleeding volume, pay attention to the change of pulse and blood pressure, and decide whether to input fluids or even transfuse blood according to the situation. After understanding the systemic condition, local examination should be performed and the bleeding should be treated according to the cause. For bleeding caused by systemic factors, such as hemophilia, prevention should be the main focus, and if necessary, further consultation and treatment should be conducted in consultation with an internist. For bleeding caused by local factors, such as residual inflammatory granulation tissue in the alveolar sockets, soft tissue laceration, fracture of the alveolar bone, dislodgement of clots, rupture of small blood vessels in the alveoli or well-known blood vessels such as the inferior alveolar vessels. Once the cause of bleeding is identified, symptomatic treatment can be performed. When there is granulation tissue in the alveolar sockets, it should be removed thoroughly in order to stop the bleeding. When there are lacerations in the gums, they should be sutured. In most patients with extraction wounds, blood clots can be seen above the alveolar fossa and bleeding, so gauze can be used to remove the clots above the alveolar fossa, place hemostatic powder, and then compress with gauze rolls. If the bleeding cannot be stopped, the gums on both sides can be sutured with horizontal mattress sutures, which can reduce the blood flow by straining the mucoperiosteal flaps on both sides of the extraction wound and help to stop the bleeding. This is because most bleeding does not come from the alveolar fossa, but from the surrounding soft tissues. After suturing and compressing for 5 minutes, if the bleeding still does not stop, apply gelatin sponge and hemostatic powder into the alveolar fossa and then bite the gauze roll to compress and stop the bleeding. For bleeding in the alveolar sockets, if the bleeding cannot be stopped by the above methods, the blood clots in the extraction sockets can be removed under local anesthesia, and pressure can be applied after filling the sockets closely with a long iodoform gauze strip, which can often receive the effect of hemostasis. After treatment, wipe the blood clot in the mouth with gauze soaked in cold water to prevent the patient from feeling uncomfortable and coughing, which will prompt the wound to bleed again. The iodoform gauze is removed after 1 week.