re: Root canal gone wrong.

quote:

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this doesnt make any sense, fake scientist. You cant even make up a plausible story on the OT. Anesthetics are to deal with nerves. Unless your nerves are encased in carbonite and dont connect to your brain, except wirelessly, ahh frick it. you're a complete buffoon and a liar.

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He's probably talking about an intrapulpal injection. Sometimes a "hot" tooth won't get numb from a local injection or a nerve block. In these cases, sometimes an injection directly into the pulp (or "nerve" within the tooth) is the only thing that will get it numb. But first you have to drill through the enamel and the dentin, which will hurt like a sonofabitch since it isn't numb. Once you drill "deep enough" and expose the pulp chamber, you can then inject directly into it and finally get adequate anesthesia.
And a good dentist can handle just about any routine root canal, but a good dentist will make even the most difficult root canals look textbook. I almost never did molars, unless things were really slow at the time. Occasionally I'd throw the endodontist an easy tooth, but only if it was a real pain in the arse patient.
ETA: despite root canals being one of my least favorite things, my success rate was well over 95%. The key to a high success rate is good case selection. But I've seen endodontists do things that I considered physically impossible.