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What about "Sensodyne Pronamel"? There is usually someone in the comments raving about its effects.

I think usually they rave about Novamin, which, at least in Canada, isn’t in the Pronamel line IIRC but in other Sensodyne branded toothpastes.

_EDIT: “repair and protect”_

This was a good comment thread on which brands or markets had what with regard to hydroxyapatite:

I can be that someone this time. The ”repair and protect” version has helped my low-level toothache.

I've actually been occasionally using Enamelon because it was recommended by my dentist for sensitivity and I think it actually works.

I'm going to try Boka as recommended above though, it seems like a more updated and modern solution.

Did you tried :D ?