After a tooth extraction, it’s important to follow your dentist’s or oral surgeon’s instructions for post-operative care, including how often to change the gauze placed over the extraction site. However, here are some general guidelines:

1. Immediate Post-Extraction Period: Immediately after the extraction, your dentist or oral surgeon will provide you with a piece of gauze to bite down on. This helps control bleeding and allows a blood clot to form in the socket. You should keep the gauze in place with gentle pressure for about 30 minutes to an hour.
2. Changing Gauze: After the initial 30 minutes to an hour, you can remove the gauze and check if the bleeding has stopped or slowed significantly. If it has, you don’t need to replace the gauze. If bleeding persists, you can moisten a piece of gauze, fold it, and place it over the extraction site. Bite down gently for another 30 minutes to an hour. Repeat this process if needed.
3. Frequency: Generally, you should only need to change the gauze if there is active bleeding. This means you may need to change it every 30 minutes to an hour for the first few hours after the extraction. After that, if bleeding continues, it’s advisable to contact your dentist or oral surgeon for guidance.
4. Duration: Typically, bleeding should subside within a few hours to a day after the tooth extraction. You should not need to use gauze for an extended period. If bleeding persists beyond 24 hours, contact your dental professional for further evaluation.

Remember to follow all post-operative care instructions provided by your dentist or oral surgeon, including any restrictions on activities, dietary recommendations, and medications prescribed for pain or infection prevention. If you have concerns about the bleeding or the healing process, don’t hesitate to reach out to your healthcare provider for guidance.