What caused this massive megalodon’s mega-toothache?

PO2 Russell "Russ" Lincoln
..."In humans and other mammals, genetic factors, disease or injury can sometimes affect tooth buds and cause a dental abnormality known as "double tooth pathology," in which a single tooth grows with a split running lengthwise down the center, the study authors wrote. Such teeth can represent two tooth buds that combined to form one tooth, a process known as fusion, or a single tooth bud that divided, known as gemination. However, little is known about this pathology in sharks."...