I have been brushing my teeth with a kind of neem oil toothpaste. At first I thought it tasted revolting, kind of like a type of soap!
After trying it for a few days, I noticed that It was growing on me a little. I now don't really mind it at all. The main reason I purchased it was because it was fluoride free. It does seem pretty refreshing actually! (once I got past the soap visualizations)
