I just got back from the dentist. Yuck! I am having two crowns and a bridge done -- something that I have put off for years. I have not had to have Novocaine for ten years. He hit my nerves two times in giving me the injections. And he did not use any oral numbing agent first. OUCH! I am going to a new dentist and was told that this one was was really gentle. I really hope it does not last all day. At this point the my ear and most of my tongue are also numb. I also hate the sound of the drill, and the horrible taste in your mouth while they are drilling.