1) i've located pure, powdered calcium carbonate in windsor. i can pick that up when i go out.
2) i cannot locate pure, powdered nanohydroxyapatite (powdered tooth enamel). there are some supplements bound to magnesium, which aren't useful for this purpose. i sent an email to an engineering company asking them to send me a baggie for a $20.
3) i looked up the ingredients for the various nanohydroxyapatite toothpastes, and every single one of them either had some kind of sugar in them or had something acidic in them :\. well, except the expensive one, apagard - that seems ok. the only one available in stores has carrageenan in it, and i went over that - that breaks down into sugar in the presence of amylase. the risewell looks like it might be ok, but it's full of all kind of weird shit like lemon peels. call me skeptical about brushing my teeth with lemon peels. so, i may need to get the powder in bulk, somehow.