Which statement best describes hydroxyapatite's comparison to fluoride for cavity prevention?

• A. Superior to fluoride
• B. Non-inferior to fluoride
• C. Inferior to fluoride
• D. Not comparable

Answer: (B)

Hydroxyapatite can provide enamel remineralization effects that are comparable to fluoride in preventing cavities. In head-to-head studies, nano-hydroxyapatite toothpaste often shows caries-prevention outcomes that are not worse than fluoride toothpaste within predefined margins, meaning it is non-inferior. This framing reflects that hydroxyapatite is at least as effective as fluoride in the tested conditions, even if it isn’t proven to be superior. Fluoride has a long-established track record, but the evidence supports hydroxyapatite as a viable alternative with similar protective effect. The other options would require clear superiority, clear inferiority, or lack of comparability, which isn’t supported by the direct comparison data.