After a tooth extraction, dentists will give patients gauze to bite down on immediately. The extraction site may continue to bleed a bit and then ooze for a day or so afterward. This is normal, but it’s not something that people want to deal with. A solution that is often more efficient than stuffing gauze in your mouth is to use a tea bag.
Tannins and Bleeding
Green and black tea contain tannins. These are compounds that contribute to the bitter taste of tea that’s been left to steep for too long. They also promote your body’s ability to create clots, which is exactly what you need to have happen after an extraction.
When you take a wet tea bag that has cooled — never use a hot tea bag, of course — and bite down on it, the tea that seeps from the bag delivers those tannins to the extraction site. A 2014 study found that green tea extract placed on gauze may help as well, but for many people, simply steep a regular bag of tea leaves.