Is hydroxyapatite better or worse than fluoride?

• A. Superior
• B. Non-inferior
• C. Inferior
• D. Dissimilar

Answer: (B)

Think of the question in terms of how two remineralization agents compare in effectiveness. Fluoride has long been established as a standard for strengthening enamel and preventing caries, while hydroxyapatite is designed to mimic natural tooth mineral and help remineralize surfaces.

When studies compare the two, they often use a non-inferiority framework: is hydroxyapatite not worse than fluoride by more than an acceptable amount? The evidence most often supports that hydroxyapatite performs at least as well as fluoride within that margin, meaning it is non-inferior. It may provide similar caries-prevention benefits and enamel remineralization, and it can also help with dentin hypersensitivity in some formulations. It isn’t consistently shown to outperform fluoride (superior), and the data aren’t typically framed as clearly inferior. The term dissimilar isn’t the standard conclusion used for trial results.

So, the best description is that hydroxyapatite is non-inferior to fluoride.