How long do you have to have gauze stuck in your mouth after a tooth extraction?

Check them in 30 min: Good pressure with gauze will help a clot form. This will prevent dry sockets, and allow healing. Check the guaze in 30 minutes then change them about every hour. Sometimes you can be done with them in a hour, and sometimes you have to change them several times. If you are still bleeding, use thumb pressure on the gauze.

Until bleeding slows: The gauze is placed to put pressure on the site. This helps form a blood clot. Usually 1 hour.