There are 2 main reasons why a toenail could dislodge from the nail bed: Injury and infection. With injury this might happen rather quickly. On the other hand, for a nail to become loose due to infection would take quite some time.

According to the Dept. of Health and Human Services, 30 to 35 Mil people in the US will at some time in their lives experience nail fungus. Nearly half are over the age of 70!