A guy is taunting a restrained vampire saying he(vamp) will make him immortal, and when he leans in the vampire bites his entire face off.
A few minutes later he does come back but as a faceless gaping head with only a giant mouth full of teeth.

I think it might be this sequel to "Dracula 2000":

Dracula II: Ascension (2003)
Dracula II: Ascension - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Dracula_II:_Ascension)