I'm late to the thread, but just wanted to reiterate what others have said. The "pinch" of the anesthetic injection was probably the worst pain. The process was relatively quick, especially if they're only doing one tooth. Heck, the real pain was covering the costs that my insurance didn't cover. :)

My guy did have me use a bite block to hold my mouth open. Very handy, definitely made it easier. When the process was all said and done, my jaw was a bit sore from being in that position for that long. But that past very quickly.

Be sure to communicate with your dentist and be honest. Before, after, and during the procedure. You're the patient here, and they need to listen to you especially as it pertains to what you're feeling. If you're still feeling anxious (and who could blame you), you might ask to have one of those heavy xray blankets. It acts like a "weighted blanket" and can really help with some of those nerves.