I had the same thing happen only the doctor kept pumping anesthesia into my jaw and apologizing profusely but he had to open the tooth as it was abscessed and if he didn't drain it the top of my head would feel like it was exploding. I knew him as I worked with his wife on OB. I was sweating and gripping the arms of the chair until my knuckles turned white and my fingers ached. He drilled and apologized. 30 some odd shots later I went home with an open tooth and a stunned expression on my face. First time I discovered that I had a high pain threshold. LOLIt was, the dentist gave me novocaine but the tooth was infected and the drug did not numb me. I begged him to knock me out with gas or something but he just kept working. No wonder i hate going to the dentist!