The bearfoot oregano - I dilute it with olive oil as he recommends though - half and half. I's pretty strong.
Molly - I do it for a couple of days now and then I back off and wait a while and then resume. I can't go a whole week. I noticed last week after I had been doing it and then stopped because of the pain, that my teeth were kind of dirty looking and then when i OP'd with coconut oil they were really white again, so maybe you are right about the bacteria thing. Maybe the oregano brings it all to the surface and then the coconut pulls it out. Interesting.