Just tested a 50:50 mixture of OTC hydrogen peroxide and water, swishing it for 30 sec then spitting all x 2, provides some relief of the "coating" of my my mouth. It caused no pain almost everything else does. It foamed up a lot so I had to stand at the sink and spit it all out, but I think he foaming action is oxygen killing germs so .

I then used a toothbrush that I heated under hot water to help debride the coatings on my gums/ roof of mouth tongue and teeth.

My mouth feels cleaner now than it has in a couple weeks. I have tried the same brushing with toothpaste and or after sodium baking soda swish and he diff is considerable using hydrogen peroxide. Hope this helps!!!! I feel so much better right now.