Unfortunately the success rate for root canal redo is very low. I would save your money along with post crown placed on a compromised root canal that could fail or fracture and consider implant instead. I'm unable to see the rest of your teeth so I can't evaluate your restorative options.
Hard to say, but endodontists can salvage many failed root canals. The follow-up question is: after redoing the root canal, will there be enough tooth left to put on a crown and repair the structural damage? Root-filled premolars are quite weak and it seems you do not have molars, so based on the little info we have been shown, I would suggest an extraction, and look more for an implant.
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