I did have a dentist redo a root canal using laser.
I wasn't ready to give up my tooth even though that
is probably the healthiest option.
Lasers for root canals were recommended by Dr. Bob Marshall.
The dentist used a Waterlase laser first, that was painless.
Then she used a hot laser and I was in a lot of pain for many
months after that. The canal was filled with a resin, not
gutta percha. This was a year ago.
So far thankfully, I don't have adverse health effects.
Good luck.