dont know what others have told you, (btw, i dont know the answer to your question), but, u shouldnt be using teeth, at all, never, for no reason what so ever, well, at least that is my view, i love necros and all, but teeth? thats like using telekenises as your main attack move when your a sorceress, although fun (ive tried it), there is no need for it.
sorry, i guess i got a little meen there, and didnt do my research, should have answerd the question instead of going on a temper tantrum about how i dont like teeth, alhtough, i still dont like teeth, my view on them are better now because of alainpp66.
yea, u can only hit one per cast. however, teeth is really quite strong, just max it and it's synergies and i dink it should do quite a bit of dam. I had a friend once tat did it, and he just breezed though. ^^