After a tooth is extracted, the extraction socket itself is made of alveolar bone and bleeds inside the socket, where the blood coagulates and forms a clot. A normal healing extraction socket is filled with blood clots. If a patient frequently licks their extraction socket with their tongue or picks at the clot in the extraction socket with their hands, there is a high risk that the extraction socket will become infected. After the extraction socket becomes infected, that is, the clot is dislodged and there is no tissue to protect the extraction socket, the alveolar bone is exposed at this time, which will lead to severe pain in the extraction socket and require prompt anti-infective treatment, which is also known as dry socket syndrome. This condition is also known as dry socket. Once dry socket occurs, the extraction socket will need to be rescraped to allow the clot to refill the entire extraction socket.