Tooth extraction is an invasive surgery and since it is an invasive surgery, the wound will bleed and the clotting factor in the body will clot the blood and form a clot, so that something black will form in the extraction socket, which is a clot and the patient should not worry about it. If you find something grayish white coming out of the incision or yellow pus coming out of the incision, it means the incision is infected. The black is a clot, and the gray and yellow belong to infection, so patients should pay attention and remember to seek medical attention promptly. Patients should often rinse their mouth with mouthwash after surgery to keep their mouth clean and avoid infection.