{"id":223,"date":"2026-08-17T00:00:00","date_gmt":"2026-08-16T16:00:00","guid":{"rendered":"https:\/\/hapresearch.com\/blog\/?p=223"},"modified":"2026-08-12T18:46:58","modified_gmt":"2026-08-12T10:46:58","slug":"four-trials-out-of-sixty-eight-what-the-hydroxyapatite-evidence-supports","status":"publish","type":"post","link":"https:\/\/hapresearch.com\/blog\/four-trials-out-of-sixty-eight-what-the-hydroxyapatite-evidence-supports\/","title":{"rendered":"Four Trials Out of Sixty-Eight: What the Hydroxyapatite Evidence Actually Supports"},"content":{"rendered":"

The tube design is finished. The claim line sits under the brand mark, six words long, and legal has asked the only question that matters: what are we citing for that?<\/p>\n

It sounds like a small ask. Hydroxyapatite has been studied in oral care for decades; the literature runs to thousands of papers. Surely one of them says the thing on the tube.<\/p>\n

Sixty-eight papers, four trials<\/h2>\n

In March 2025, a team led by Chatzidimitriou published a systematic review and meta-analysis in the Journal of Dentistry<\/em> asking exactly that question: do hydroxyapatite toothpastes prevent and remineralise early caries lesions? They searched the literature and retrieved 68 studies. After applying their eligibility criteria, four remained.<\/p>\n

Four randomised controlled trials. That is the evidence base, pooled.<\/p>\n

The pooled result was not what either side of the fluoride argument tends to claim. On the development of new lesions and the progression of existing ones, the review reported \u201cno significant differences between HAP and fluoride toothpastes\u201d \u2014 a risk ratio of 0.98 (95% CI 0.85\u20131.12, p = 0.61) and an odds ratio of 0.90 (95% CI 0.57\u20131.42, p = 0.68). Confidence intervals straddling 1.0 in both cases.<\/p>\n

What \u201cno difference\u201d bought<\/h2>\n

That reads like a null result. It is better understood as a pass mark on a different exam.<\/p>\n

The largest adult trial in the field was designed on precisely that logic. Paszynska and colleagues ran an 18-month double-blinded randomised controlled trial across two centres in Poland, powered as a non-inferiority<\/em> study \u2014 189 adults in the intention-to-treat analysis, 171 completing per protocol. After 18 months, no increase in the DMFS index was observed in 89.3% of the hydroxyapatite group against 87.4% of the fluoride group. The authors concluded that hydroxyapatite \u201cwas proven to be a safe and efficient anticaries agent in oral care.\u201d<\/p>\n

Non-inferiority is a real finding. It is also a narrow one: it licenses as good as<\/em>, not better than<\/em>.<\/p>\n

The trial that did find a difference<\/h2>\n

And then there is the one that found superiority. In 2025, Cocco, Campus and colleagues published a triple-blind randomised trial in the International Dental Journal<\/em>: 610 children enrolled, 518 completing, followed for 24 months. The hydroxyapatite arm showed a statistically significant reduction in enamel lesions against the mono-fluoridated comparator (P < .01); of 78 active lesions in that arm at baseline, close to 75% were inactive at follow-up.<\/p>\n

Read the arms carefully, though. That trial did not test hydroxyapatite against fluoride. It tested magnesium-, strontium- and carbonate-substituted hydroxyapatite in a chitosan matrix, with fluoride<\/em>, against fluoride alone. A different material, answering a different question.<\/p>\n

So the six words on the tube depend entirely on which comparison your grade was actually in. \u201cAs effective as fluoride\u201d has four trials behind it. \u201cMore effective than fluoride\u201d has one \u2014 and only for a substituted, fluoride-containing, chitosan-carried material that a generic powder is not.<\/p>\n

Which is the uncomfortable part for anyone sourcing. None of this evidence transfers to a material by name. It transfers to a material by specification \u2014 substitution chemistry, carrier, particle characteristics, the lot-to-lot consistency that makes your product the thing that was tested rather than something that shares its INCI entry. The claim is only as defensible as the sameness of what goes into the tube.<\/p>\n

Sources<\/h2>\n

Chatzidimitriou K, Theodorou K, Seremidi K, Kloukos D, Gizani S, Papaioannou W. \u201cThe role of hydroxyapatite-based, fluoride-free toothpastes on the prevention and the remineralization of initial caries lesions: A systematic review and meta-analysis.\u201d Journal of Dentistry<\/em>, 2025 \u2014 pubmed.ncbi.nlm.nih.gov\/40107597<\/a>. Paszynska E, Pawinska M, Enax J, Meyer F, et al. \u201cCaries-preventing effect of a hydroxyapatite-toothpaste in adults: an 18-month double-blinded randomized clinical trial.\u201d Frontiers in Public Health<\/em>, 2023 (open access) \u2014 doi.org\/10.3389\/fpubh.2023.1199728<\/a>. Cocco F, Salerno C, Wierichs RJ, Wolf TG, Arghittu A, Cagetti MG, Campus G. \u201cHydroxyapatite-Fluoride Toothpastes on Caries Activity: A Triple-Blind Randomized Clinical Trial.\u201d International Dental Journal<\/em>, 2025 \u2014 pubmed.ncbi.nlm.nih.gov\/39971658<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

A brand wants \u201cclinically proven to remineralise\u201d on the tube. The literature runs to thousands of papers \u2014 but the meta-analysis found only four trials it could use. What does the evidence actually license you to say?<\/p>\n","protected":false},"author":1,"featured_media":232,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_bctitle":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_opengraph-image-id":0,"_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_twitter-image-id":0,"footnotes":""},"categories":[4],"tags":[53,9,36,54,16],"class_list":["post-223","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-science","tag-clinical-evidence","tag-hydroxyapatite","tag-oral-care","tag-product-claims","tag-remineralisation"],"yoast_head":"\nFour Trials Out of Sixty-Eight: What the Hydroxyapatite Evidence Actually Supports - HAP Research<\/title>\n<meta name=\"description\" content=\"A 2025 meta-analysis pooled just 4 eligible trials: hydroxyapatite matched fluoride on caries (RR 0.98) but did not beat it. 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