The application of ice packs for external application is not recommended five days after tooth extraction. In most cases, five days after tooth extraction, the corresponding extraction trauma symptoms are not particularly obvious. Even in the case of relatively serious extraction of buried wisdom teeth, the swelling and pain will be more severe on the second day, or at most the third day, after the extraction, and then the pain and swelling will be significantly reduced with the passage of time. If the pain and swelling are still particularly obvious after the fifth day of tooth extraction, attention must be drawn to the fact that it is possible that this is not just post-operative physiological swelling, but post-extraction infection, and it is necessary to go to a professional dentistry department as soon as possible to check the extraction wound and carry out the necessary treatment.