How long to ice after wisdom tooth extraction depends on the actual situation of the patient to analyze. If there is no obvious swelling and pain after wisdom tooth extraction, no ice compress can be applied; if the trauma is large and there are obvious symptoms of swelling and pain, ice compress can be applied appropriately, usually for 1 minute and suspended for 1 minute, or take cold towel to apply cold compress for about 10 minutes. In general, it is recommended to apply cold compresses intermittently for 24-48 hours after wisdom tooth extraction to reduce tissue edema. Wisdom tooth is a difficult tooth to be extracted in the oral cavity, and the extraction trauma is generally large, which may cause local swelling and pain. Applying ice compress after tooth extraction can make the blood vessels in the trauma contract, slow down the blood flow and promote coagulation to stop bleeding. Therefore, it is generally recommended to apply ice packs within 24-48 hours after wisdom tooth extraction. Ice packs can be applied with a special ice bag, wrapped with a towel or thicker cloth and placed on the skin of the cheek where the tooth was extracted, which can play a better role in constricting blood vessels and stopping bleeding. If the edema is still obvious 48 hours after surgery, hot compresses can be applied again to promote the reduction of swelling. During the recovery period, oral anti-inflammatory drugs can be taken under the guidance of the doctor, which can effectively prevent bacterial infection. Patients themselves should also pay attention to the local hygiene of the wound to avoid affecting the wound recovery. The diet should be light, with a balanced diet of meat and vegetables, and spicy and hard foods should be avoided.