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I've been using a remineralization toothpaste imported from Japan for several years now, ever since I mentioned reading about remineralization to a dentist from Japan. She recommended the brand to me. FDA is apparently bogging down release in the US, but it's available on Amazon anyway. It seems to have slowed, but not stopped, the formation of cavities. It does seem to result in faster plaque build-up around my gumline, like the bacterial colonies are accumulating some of the minerals not absorbed by the teeth. The brand I use is apagard. [Edit: I'm now trying the recommended mouthwash CloSys as the link above recommended, using it before brushing, and using Listerine after. The CloSys seems quite gentle and pleasant as a mouthwash. Listerine is harsh, but does leave my teeth feeling cleaner for much longer. I'll try this for a few years and see if it changes my rate of cavity formation.]