Necessity was the mother of invention where this correction is concerned. Two weeks before Christmas a friend of mine had oral surgery on a Friday morning. That evening she was in a world of hurt. Her oral surgeon had given her no medication and had left town. Her dentist was unavailable. She called me in tears and asked if I could do anything to alleviate her pain. I told her to come over. In twenty minutes she got off the table without any pain, and went to the mall shopping with her friend that had driven her to my house.