I had a root canal done on an upper molar by a specialist earlier this year. My own (NHS) dentist said she could do it, but my teeth have long, curled roots, and she might not be able to do as good a job, so I would need referred out anyway. I opted to go straight to the specialist, and while it was cripplingly expensive, I knew the risks, and also that his success rates are much higher than a general dentist.
I did LOADS of reading about root canals, and failures, to the point I went quite mad. It appears that the key things that lead to failure are:
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a canal or bit of a canal in the root is missed/not properly filled. Less likely to happen with the specialist, as they have super-powerful microscopes that most general dentists don't have. These spaces are so tiny, and are like a road network in there.
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Something happens to damage the root system while they're in there - eg, a file is left, it's filled too high.
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The tooth is cracked/fractured, in which case there's no real point in going on.
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The tooth's not properly restored after the root canal, so it's more likely to be brittle and crack or break with eating.
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There is a load of infection in the tooth, and it's not possible to clean it out properly in the allocated time. The specialist I saw said I was paying for the treatment, not the appointments, so if he had to go in and out of the tooth ten times to get it totally clean and sealed, the fee would remain the same.
Most general dentists will do root canals routinely, but the specialist endodontists only do root canals. The guy I saw - who was great - said that he would be happy for any one of his dentist friends to do a root canal on a tooth up to a premolar, but beyond that he would want it to be an endodontist friend. All a bit more manageable if you get mates' rates though!
On the flip-side, I am missing a lower molar, and have no issues with the gap. I had a root canal on it about 20 years ago, by a general dentist, and it didn't go brilliantly. At the time I was a student and referral to a specialist wasn't even suggested, and I couldn't have afforded it anyway.