[LEAKYSEALS951]

why did you have the rct done last year in the first place?
decay? infection? was the tooth cracked?
Was the dentist who treated the root canal a general dentist or an endodontist?
If a general dentist did it, it might make sense to have a specialist look at it for a second opinion. They have better imaging equipment (limited field cbct) which is better than traditional radiographs, and even better than the large field cbct's some general dentist have.
Depending on the problem though, and how it shows, that might not even be necessary. Tomorrows eval could show an obvious problem.
It could be a gum issue, but the dentist should be easily able to rule that out. Also cracked teeth (or failed rcts) can cause gum issues.
Second molars are under the most stress in the mouth and are notorious for cracking.
These can be tricky to diagnose, and treat, with a guarded prognosis at best.

Usually knowing the history (what was originally wrong) and a new radiograph (what's going on right now compared to last year) can provide a lot of clues.


Good luck.
R