Ice packs can be applied after tooth extraction, and they can be applied 48 hours after the initial extraction to help local vasoconstriction and relieve bleeding. However, it is not necessary to apply ice after all extractions, and it is not necessary for less traumatic extractions. For example, the patient will not experience significant swelling and pain after the extraction of alternating milk teeth or simple anterior teeth, so ice is not necessary. Clinically, ice is commonly used in the extraction of blocked wisdom teeth, which requires gingival incision, flap and bone removal, which is relatively more traumatic and bleeding, and the side effects of swelling and pain are also greater after the operation, so it is better to apply ice intermittently in this case.