After tooth extraction, it is normal to experience pain after the anesthetic has worn off, which usually subsides or recovers in 2-3 days. However, if severe pain occurs 2-3 days after the extraction, radiating to the auriculotemporal region, the submandibular region or the top of the head, and cannot be relieved with normal pain medication, then dry socket syndrome may have occurred. The clinical manifestations are an empty alveolar socket with a corrupt and degenerated blood clot, which is off-white in colour, and a foul odour from the broken dead material covering the walls of the socket, and should therefore be treated promptly.