I forwarded it to my son who’s a chemist.

I’ve heard it but forgot it so thanks!

Non-scientific minds might not get it.

He was naturally worried it would hurt until I told him it was just water with oxygen in it. I took a small swig, swished it around my mouth and spit it out. He used it on every scrape since.

With hydrogen peroxide almost certainly..it struck me at the time. Must be at a very low dose like 0.001% w/v if that is the correct unit.

Edit: wow was I off..it is more like up to 3%
https://www.medicinenet.com/safe_to_rinse_your_mouth_with_hydrogen_peroxide/article.htm

From 50 year old memory of the periodic table.

it is better to use 'also'.

It cured his Covid.