Cold compress within 48 hours after tooth extraction and hot compress after 48 hours: 1. Cold compress within 48 hours helps to reduce the bleeding of the wound and the swelling of the face at the early stage after tooth extraction; 2. Hot compress after 48 hours helps to accelerate the local blood circulation of the wound to promote the decreasing of blood and swelling. The swelling after tooth extraction varies greatly among individuals and is also related to the complexity of the wisdom tooth. Generally, the swelling is most obvious on the third day after surgery, and then gradually begins to subside, and it takes one month for the swelling to completely subside in some patients. Cold compresses can be applied with ice water, ice cubes, ice sticks, etc. It is necessary to pay attention to intermittent cold compresses to avoid frostbite; hot compresses can be applied with hot towels.