You can also make some pretty good "Teeth" using shower curtain "Rings". I cut the circle to make the fang-angle I want, Dremel the point, and curvy big fangs come to life! The plastic is pretty tough stuff. I made a big bunch of them and attached them to the exterior wall of my Puppet Theater Castle, en-mass to give a strange, aggressive look to the whole thing.
The shower curtain rings I used were rather thick and maybe more old-fashioned but I saw such a product in "Wally-world" the last time I was there.