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A 40-year-old member asked:

Does stannous fluoride really repair enamel like it claims to?

1 doctor answer1 doctor weighed in
Dr. Scott Bobbitt
Dentistry 33 years experience
Not exactly: At acidic ph (~5.5), the hydroxyapatite crystal of tooth can dissolve; add bacteria and you get "tooth decay." stannous ion (tin) is antimicrobial. Fluoride ions insert into the outer layers of hydroxyapatite crystal that makes up the mineral content of enamel and root dentin. Fluoride ion doping of the tooth crystal increases resistance to acid dissolution. It does not "repair" enamel or dentin.

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Last updated May 10, 2019
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