A dry socket is a complication that occurs when?

A dry socket, also known as alveolar osteitis, occurs when a blood clot that has formed in the socket of an extracted tooth is dislodged or becomes absent. This blood clot is essential for the healing process as it protects the underlying bone and nerve endings from exposure, infection, and air. When the clot is dislodged, it can lead to severe pain and put the bone directly in contact with the oral environment, resulting in inflammation and complications during healing.

Option B highlights the importance of the blood clot's integrity post-extraction. Without it, the healing process is compromised, leading to the symptoms associated with a dry socket, such as throbbing pain and an unpleasant odor. The management of this condition often involves cleaning the socket and possibly placing a medicated dressing to alleviate pain and promote healing.