Earlier quoted context omitted.
My teenage cavities stopped after 1) eating less sugar, and 2) switching to a non-fluoride toothpaste. Now that I'm in my 30s, I have had no cavity issues thus far, but I do have a lot of chipped teeth. I should try fluoride toothpaste again, in order to see 1) if it was the lack of sugar that reduced my cavities, and 2) potentially strengthen my teeth.
Have you tried hydroxyapatite? Just curious. (The chemical name is hydroxy L apatite, but it's usually spelled without the L in toothpastes. There's a heated debate about this on the wikipedia talk page.)
[0] https://coraltoothpaste.com/products/coral-white-mint-toothp...