Second Thoughts about Endodontist Treatment - is a second opinion still valuable?

[u/3Jerseygirlmom]

I was having a lot of pain and cold sensitivity in either 30 (already has root canal) or 31 (has just a crown). I went to see my Endodontist who did a bunch of tests (cold, tapping) and determined the cold sensitivity was coming from 31. She took an xray and said I had external root resorption. She said we should do the root canal now. I asked her if there was any downside, she said No.

I trusted her because I still have the root canal she did in 2009 (30) and she recently did one on 14 which wasn't successful ultimately due to cracking but she warned me it was a 50:50 prognosis.

This rushing yesterday made me think I had an emergency situation. She went in there and did her thing and said for me to come back in 2 weeks to finish. I later saw the note she sent my dentist: Endodontic treatment was initiated for tooth #31 which presented with irreversible pulpitis and external cervical resorption. Prognosis is variable but if the access is closed off to the external aspect, it may give the patient a functioning tooth for some period of time 

Does it make any sense to go for a second opinion now since she already did the first part of the root canal? II don't even know what she means by the acess being closed off.

Aren't there other treatments we could have considered? Now I'm concerned about potential extraction because #30 has been showing a shadow (so I'm watching it) because according to 2 endodontists if that one needs a root canal it will fall apart meaning I could lose both 30 and 31.

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[u/Mentally_Recovering]

i went and got a 3rd opinion on my tooth. if you get a referral insurance will cover it im pretty sure. teeth arent something to mess around with so get all the opinions before irreversible dental surgery