I know I told you this earlier, but having seen other pictures with the "Great White Teeth Veneers," I still really don't like them. They just look kind of silly. >3>
As for the other teeth, I'm realizing, what you MIGHT be able to do is get a mold-able mouth guard (for contact sports and such) and attach fangs to it somehow. I know there's a tutorial about making a false set of teeth in my costuming book, so I'll look at that and see what it has to say.