I have always had trouble at the dentist office. The air suction tube makes my all my teeth throb with pain. If my teeth dry off they do the same thing. Water can not be spayed onto my teeth either. Here is the really bad thing, I don't ever get completely numb. I do get them cleaned regularly and I have minimal receding gums, no real issues to cause all my problems plus I was like this as a kid as well. The only way I get a filling or root canal now is with valium or equivalent. I really should replace some of my old fillings but I am getting stressed out just thinking about it.