I’ve read multiple journals on this subject, and I can’t seem to find a logical explanation as to why they substitute calcium fluoride for sodium fluoride. Matter of fact, all the research i’ve read highlights dangers with the use of the sodium fluoride version including reductions in intelligence (in mice ).
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Strictly speaking, what we get in our teeth from fluoride is fluoroapatite rather than calcium fluoride.
But we don’t use calcium fluoride, a.k.a. fluorite in toothpaste because it isn’t very soluble in water. The fluoride ions are locked in a crystal structure with calcium ions and don’t readily transfer to our teeth. So calcium fluoride in toothpaste would be useless. Sodium fluoride is much more soluble in water. Free fluoride ions in solution can easily find their way to our teeth.
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