You and wife might want to check out banned netflix documentary called root cause. I had one 20 years ago and and just had it removed last year after they randomly found an abcess that had been there for God knows how long. A friend of mine just had a hysterectomy and is young, after a 15 year root canal (they also found a cyst) was removed but she believes too little too late. once they take the nerve out you cant tell its even infected because you cant feel the pain. basically , people are finding out root canals arent all that theyre made out to be. You end up with an infection in your gums causing havoc and no way to know its there and most dental offices dont carry sufficient xray equipment to even detect it. You have to find an office with a beam xray scanner. I would change dentist to any that has above equipment , so at least you can catch it early if/when the root canal turns into a detectable infection, and it probably will.