I put H2O2 (Hydrogen-Peroxid) in my rinse water after brushing. One swallow of it is used for gargling too. I often brush with baking soda and a touch of salt but the salt irritates my gums. Maybe I'll just add it to the rinse water with the H2O2.
Wow, you've tried lots of oils! I think I'll start doing that too until I can find some combo I like! I think mint would be very refreshing!!