After your dentist extracts a tooth, a blood clot forms to fill the empty area left behind by the removed tooth. This blood clot provides a protective barrier between the mouth and the exposed nerves and bone underneath, until the gum tissue heals and closes over the extraction site. But in some cases, the blood clot becomes dislodged before the gum tissue heals – a painful condition called alveolar osteitis, or dry socket. In the absence of a blood clot, the extraction site