Very interesting post, I have not heard about this before.
I have a gum that smells next to one Molar, I assume it will develop into an Abscess eventually.
No pain yet but I had the Molar next to it out 2 weeks ago because of a smelly gum that developed into an Abscess. Both teeth had root canal work done 12 years ago.
I am in the UK and have found 100% Oregano oil for sale online.
As you mentioned it should not be ingested just swished around the mouth. I can add a couple of drops when I Coconut oil pull everyday.
As far as the Bentonite clay goes. I have found Calcium Bentonite clay. It looks like powder in the picture, is that the correct one?
Some advertise Sodium Bentonite, others Calcium Benonite.
I would assume 100g would last a long time and would be a good amount to test with.