i was about to say the same thing AJP!

it's possible to have a second root canal procedure on the same tooth if the actual root is stable. i have had ongoing root canal treatment on a front tooth that is yet to be finalised. i had a cyst at the end of the tooth (not sure if cyst caused death of tooth, or vice verse), so first root canal worked temporarily (about a year), second time i had to see endodontist and resulted in having the cyst first lanced, and then removed (this is something i would consider worst case!). i am yeat to have the final filling of the tooth as everything has had to be done in conjunction with the surgeon, and around ivf treatments (and endodontist is 130k's away and has himself been sick so not working as much - appointments are bloody hard to get!)

don't have the tooth extracted until you've had the consult with the endodontist - and if something doesn't feel right about it (if they just "give up" on saving the tooth) push to get answers about why!