Fluoride in toothpaste changes hydroxyapatite to fluorapatite, creating a more densely packed dental crystalline structure that is more acid-resistant.

“But all of them acknowledge that those bonds and the mineralization of the teeth is stronger with fluoride.”

“Fluoride, it was discovered, can actually get inside of those LEGO chain-like crystals, the building of those, and form bonds between them that are actually stronger than the hydroxyapatite bonds that would normally form.”

“However, every single one of them also acknowledged that the bonds that are created in those mineralization chains, as I'm referring to-- I realize that's not the technical term-- is not the normal hydroxyapatite bonds that would form. They are stronger than the bonds that would normally form. They are structurally different.”

“so what fluoride does is it throws off the hydroxy group in the in hydroxy appetite and and so it changes it from hydroxy appetite to flor appetite so it restructures it a bit when it does this the bonds generally are considered stronger um and the dental crystallin structure is more densely packed so it's known to be more acid resistant”