When you had the fangs in, you wanted to be a little bit careful that you didn't actually pierce the jugular, kind of like my experience shaving Alan Rickman, which by the way neither of us want to do again, especially Alan.
The killing of everyone was the easy part, the most difficult part was lathering them up and shaving them, that's the part that freaked me out the most in [Sweeney Todd: The Demon Barber of Fleet Street ].