Use hydrogen peroxide twice to three times a day....gargle around in your mouth for a full minute and spit.
My gums were bad and teeth starting to go bad rapidly until i started this about a year and a half ago.
I brush with a small amount of baking soda ( bicarbonate).
They use Barium in the root canal process, it's a heavy metal, and they should not use it, but dentists seem to be the most resistant to change. You should have a urine test for Barium toxicity.
the peroxide/soda was a tooth and gum saver for me.