I had to have a tooth pulled and I knew I had to have one of my shots in the roof of my mouth and I was really really scared because I had one there in the past and it hurt terribly. Dr Montes said she was going to use a vibrator in my mouth to stop the pain. I did not see how it could help but when I got the shot in the roof of my mouth ( and one other) I swear I felt nothing. I remember a shot in the roof of my mouth hurt so much that my eyes watered and I could hear like a crunch noise. Thank God for the vibrator tool .. I never have to worry again if I need a shot in the roof of my mouth. No more tears!!!