I use fluoride-free toothpaste. I grew up with terrible baby teeth and weak enamel on my adult teeth, so was always getting cavities, despite taking excellent care of my teeth. I eventually had 2/3 of my teeth replaced by crowns, and now have nice, white, shiny teeth, and the overbite is gone. But, by the time I realized fluoride was bad for my teeth, it had already done its damage, hence the crowns. They're for cosmetic reasons only, and made such a huge difference in my confidence. I never use fluoride toothpaste now.

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