Ice can be applied after tooth extraction. Within 24 hours after tooth extraction, ice can be placed on the jaw face on the side of tooth extraction for cold compress, and the closer the location of cold compress is to the affected area, the more effective it is. Cold stimulation can also make the broken capillaries in the wound contract rapidly, which can greatly reduce the amount of blood exudation and reduce the sensitivity of nerve endings through low-temperature stimulation, thus effectively relieving pain. If the anesthetic has not completely worn off after tooth extraction, be careful not to apply cold compresses at too low a temperature to avoid frostbite of local soft tissues. After 24 hours of tooth extraction, it should be replaced with hot compresses to accelerate the absorption of exudate and promote further decreasing of swelling.