Not facing an extraction but now one year post, I just had a root canal and a retreat of an existing root canal done last week.

From what I know about ORN the root canals seemed safe without any HBOT. Other than some slight nerve pain on the one tooth, the other had zero pain, and a bit of puffiness I was fine.

One thing worth mentioning is that if you have any infection related side effect take the antibiotics. Even though my infection was pretty mild and I watched it carefully as it went away after a few days, my dentist said later for any oral cancer patient to take the antibiotics at the most minimal sign of infection.

It did not click at the time that an infection below the gum can be the cause for potential bone issues. How stupid it did not click but I was more focused on avoiding antibiotics unless really necessary. If ever I encounter even the slightest infection in the gum/bone area I'll be heading to the dentist in a flash!
Don