Lower-jaw teeth in frogs re-evolved after an absence of 200 million years, a new study says. The discovery challenges a "cornerstone" of evolutionary thinking, according to experts. Of the more than 6 ...

A fragment of upper jaw fossil from the Early Cretaceous is among the oldest examples of a toothless amphibian in the fossil record Chihiro Kai The arid valleys of Wyoming’s Cloverly Formation are ...

When there’s a mismatch or misalignment between your upper jaw bone (or maxilla) and the lower one (mandible), you have an uneven or crooked jaw. This can arise due to temporomandibular joint (TMJ) ...

A 29-year-old healthy man experienced a rare case of losing six teeth followed by upper jaw osteonecrosis due to an infection with shingles, a rash caused by the same virus that causes chickenpox. The ...