If one or more wisdom teeth have been removed by a dentist, there are several ways to reduce pain and swelling. One of the most common is to apply either hot or cold compresses to the affected area. The best advice:

- Experiment to see which option (hot or cold) offers the best results.
- Any compress should not be applied for longer than 20 minutes.
- Do not apply ice directly to the skin; wrap a cloth around the ice.

"Most oral healthcare professionals recommend keeping a cold compress on for 20 minutes and then leaving it off for 20 minutes."
Other methods are mentioned at this link:
https://yourdentalhealthresource.com/how-to-decrease-swelling-after-wisdom-tooth-removal/