How long to ice after wisdom tooth extraction depends on the actual situation of the patient. 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, suspend for 1 minute, or take cold towel to apply cold compress for about 10 minutes, generally it is recommended to apply cold compress intermittently for 24-48 hours after wisdom tooth extraction to achieve the purpose of reducing tissue edema. Wisdom tooth is a more difficult tooth to extract in the mouth, and the extraction trauma is generally large, which may cause local swelling and pain. Applying ice after tooth extraction can cause vasoconstriction in the trauma, slow down blood flow and promote blood clotting to stop bleeding. Therefore, it is generally recommended to apply ice packs within 24-48 hours after wisdom tooth extraction. Ice can be applied with a special ice pack, wrapped with a towel or a thicker cloth and placed on the skin of the cheek where the tooth was extracted, which can have a better effect of constricting blood vessels and stopping bleeding. If the edema is still obvious after 48 hours, hot compresses can be applied again to promote the reduction of swelling. During the recovery period of wisdom tooth extraction, oral anti-inflammatory drugs can be taken under the guidance of the doctor to effectively prevent bacterial infection. Patients should also pay attention to the local hygiene of the wound to avoid affecting the wound recovery. The patient should pay attention to a light diet, with meat and vegetables, balanced nutrition, and avoid spicy and stimulating food and hard food.