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I've had a few root canals over the years, one or two are over 20 years old and the most recent is at least 10.
I've never heard of root canals being a short term fix. None of my rc'd teeth have needed to be extracted, though I have had to replace a couple of the crowns over the years.
Get a good endodontist, have it done right the first time and you should be good to go.
Good luck!
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