Ice packs can be applied within 48 hours after tooth extraction. Ice packs are recommended within 48 hours of tooth extraction to reduce swelling and relieve pain. If it is more than 48 hours, it is recommended to change to hot packs to help the absorption of exudate. Ice compresses within 48 hours after tooth extraction can help local blood vessel contraction to a certain extent, reduce the occurrence of abnormal bleeding, and have a certain effect on the formation of localized lumps to reduce swelling, and can also play a role in relieving pain. However, it is important to note that the duration of each ice pack should not be too long, so as not to frostbite the skin or muscles. In addition, you should learn the relevant precautions from the doctor and strictly comply with them during the tooth extraction. After tooth extraction, pay attention to observe the wound condition, if there is severe pain or bleeding, go to the hospital in time for follow-up.