Typically you should be able to stop using gauze after a tooth extraction typically within an hour to a couple hours after bleeding subsides and you can replace the gauze without more significant bleeding. Only change gauze if it is permeated with blood after thirty minutes. Typically bleeding ends within 30-45 minutes, however if it was a more significant extraction or you are more prone to bleeding it could take a bit longer. If you're still bleeding after an hour, you can replace the gauze and apply gentle pressure for another 30 minutes. If bleeding persists or increases after removing the gauze, you should contact your dental office.
After a tooth extraction you can also take these steps to help your healing. To avoid getting dry socket, a painful condition that can occur if the blood clot is dislodged, don't drink from a straw and avoid crunchy foods and don't rinse or brush your teeth for 24 hours or probe the area with any objects. Eat only soft foods chewing on the side opposite of the extraction site to help prevent food debris at the extraction site and reduce the risk of infection and stay hydrated by ensuring you have adequate fluid intake, preferably with water. Avoid hot foods for a couple days. If you are a smoker do not smoke for at least 1 week as it can cause dry socket and is very detrimental to the healing process. If you have been prescribed antibiotics be sure to take them exactly as prescribed.
You can expect to have some swelling and discomfort after wisdom tooth extraction. In addition to the directions above, some other things can help with this discomfort and you should take special care in the days ahead. Your dentist will give you instructions for the days after. Elevating your head with a pillow while laying down can help. Stick to a liquid diet for at least 24 hours after surgery and make sure not to probe the area in any way. Your doctor may prescribe a painkiller to take as your anesthesia wears off. You may also want to place ice packs on the side of your face near which your surgery was performed to help with swelling.