[pimlottc]

AFAIK the European version of Sensadyne Repair and Protrct uses Novamin, not Hydroxyapatite. From what I can tell, they are similar but separate chemicals.

While not sold directly in the US, Sensadyne with Novamin is available from Amazon (usually from India).

[eth0up]

Thanks for clarifying that. I'm confused that my head still insists there was hydroxyapatite involved, but I believe you're correct. My information is over a decade old though.