I have been using Dr. Jen's Super Paste: https://drjennatural.com/products/dr-jen-super-paste-with-na...

I landed on this one out of all the N-Ha brands because it also has flouride. Also, it doesn't have SLS, which I feel good about.

I used to need Sensodyne to manage tooth sensitivity. I would go out of my way to buy Canadian or UK Sensodyne with Novamin, since the Novamin formulations aren't sold in the U.S. However, Jen's has eliminated the tooth sensitivity without needing a numbing agent like Sensodyne, which was surprising to me.

I've stuck with Jen's even though it's more expensive. I can't speak to whether it's strengthened my enamel appreciably, but my teeth feel much better.