Charlie used a simple method of taking your MIND outside the body and could watch the pain and realized the pain, but otherwise needed no drugs. Trained in marshal arts allows the body to be pounded upon with out realizing the pains and he applied that to the dental. People for a long time have known how to do this and seen people stick needles through their arms, etc. with no pain.
I quit all asperins/drugs years ago and the best thing I ever did.