Nice to see this kind of content.
I tried using this and its incredible safe for enviromental porpuses, the thing is that the brushes are not perfectly made for our mouths. The brush was incredibly hard and quite to big to reach the very back of the mouth.
I absolutelly love the iniciative, but they have to work to make it atractive to everybody. Otherwhise after trying the first time every one is going to go back to the conventional ones.