Why would I need ANOTHER root canal in the same tooth that I already had one?

I went about 6 years ago and got 6 permanent caps. She did 2 root canals and said I'll be okay. Then I went back and she said I need to get the other 2 that she didn't do and that she's going to have to "re-do" the 2 that were already done. Everyone I know is telling me go back for a second... show more I went about 6 years ago and got 6 permanent caps. She did 2 root canals and said I'll be okay. Then I went back and she said I need to get the other 2 that she didn't do and that she's going to have to "re-do" the 2 that were already done. Everyone I know is telling me go back for a second opinion (before I go through more of this crap). I can't afford this and I'm tired of going there for ALL of this WORK! =( Thanks! =/
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