Well much of the frame work for the 19th century (and modern) concept of the vampire is drawn directly from balkan/gypsy legends. Which if I recall correctly tended to be related to or indistinguishable from early "werewolf" type tales, and are usually considered to related to similar blood drinking or flesh eating animals/creatures, and canabalistic human dead traditions from elsewhere in Europe. All of these tend to involve depictions of animalistic or otherwise fucked up teeth if not the perfectly formed "fangs" we tend to see to day. I'm reasonably sure those are even more modern than the 19th century. The big Victorian vampire fiction seems vague on it, and just look at Nosferatu. So I'd ague that one of those elements that goes back a long way, longer than its clear syphilis has been a problem in Europe (especially Eastern), is animal like or jagged teeth.