The more cooperative you are when the dentist performs an injection the better it will be for you. The slower the rate, the less discomfort. If you are being a poor patient the dentist's natural instinct will be to speed up the injection process so to finish it more quickly. Additionally, when a dentist performs an injection they must place the anesthetic in the proper location, and this takes concentration. The principles behind tooth extractions.
Some people place themselves in a position of creating a self fulfilling prophecy.
They expect the injection to hurt and don't give the process a chance, thus making a guaranteed unpleasant experience for both themselves and the dentist. If you have apprehensions about injections you need to clue your dentist in, in advance, so they can address your concerns and make things as pleasant for you as possible. What to expect during the tooth extraction. When your dentist performs the extraction expect to feel a lot of pressure. The dentist needs to expand this socket to a point where the tooth is free to come out.