My dentist told me I had gingivitis, I consulted another medical doctor and he told me that it was an anorbic bacteria, meaning it doesn't need air to live.And the way to kill it was with a drug called "Flagyl".
I took for a week. Its nasty on your stomach but it works. This can be researched in JAMA Magazine about fifteen years ago. that's where my other doctor read it. It worked for me. the dentist didn't like it because he lost thousands of dollars from me.