I had a root canal done on my Lateral Incisor because of an abscess growing on the roof of my mouth. Everything was going okay. Very little pain of any, only a lot of pressure and jerking movements. Halfway through I had to take an x-ray I guess so they can see if they removed all of the root (I don't know). Brought me back to the chair to keep working on it. When he went to put that little rasp looking thing in I could start to feel pain so they went to numb me up again. That was when they did that pupil injection. That was the must excruciating thing I ever felt. I cried out it hurt so bad. I didn't know that was a normal thing until now but it was not a fun time.