When the blood clot that usually fills the socket after a tooth extraction moves or dissolves too soon, a dry socket develops. Usually, after a tooth is extracted, a blood clot forms in the socket to protect the underlying bone and nerves as the area heals. However, if the blood clot is disturbed or dislodged, the socket is left exposed. This exposure can result from smoking, poor oral hygiene, excessive rinsing or spitting, straw use, or extraction site trauma. Without the protective blood clot, the underlying bone and nerves are exposed to air, food particles, and bacteria, causing significant pain and delaying healing.