Hi Gabby, it is rare. Perhaps You must post a picture. Does this animal breed in captivity or in wild? Sometime the captivity produce theratological modification related with the tooth, some of them very rare.
I second the need of pictures to better understand what you found out. Could this be a teratoma? These tumours are known to happen in wild animals too, e.g. this deformed mountain lion with teeth and whiskers growing out of its skull, killed in Jan 2016 by a hunter in Idaho (US) for allegedly trying to attack a pet dog.
that´s a quite interesting picture, even in a puma...
I think is really strange to see teeth in bones related to the orbit or the temporal region, and even sranger in mammals (snakes and other reptiles present teeth in bones pertainig to the palatal roof such as vomer and palatines). Maybe this "teeth" that you see there is rather a teratoma, a tumor that grows teeth, hair and bone... In humans those tumors are removed, but maybe in this felid the teratoma growed until reached the skin surface and opened causing an infection...
Thanks everyone for the answers! I am reading more about the teratoma suggestion, or maybe could be a crooked tooth... If I realize that could be something different I'll let you know (=