Hydroxyapatite vs Fluoride — What the Clinical Trials Actually Show

Hydroxyapatite toothpaste used to be a niche, mostly-European product. Over the last few years it's had a real clinical evidence base built around it — head-to-head trials against fluoride, not just marketing claims. Here's what that evidence actually says, including its limits.

What hydroxyapatite actually is

Hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) isn't a synthetic additive dressed up to sound natural — it's the same mineral that makes up roughly 97% of tooth enamel and 70% of dentine by weight. Used topically in a toothpaste or tooth powder, it works biomimetically: filling in the microscopic gaps and early demineralised spots on enamel with more of the mineral the tooth is already built from, rather than introducing a different element (fluoride) that the body doesn't naturally incorporate into its mineral structure in the same way.

What the clinical trials found

A 2021 meta-analysis pooling three randomised controlled trials found hydroxyapatite toothpaste gave roughly 17% protection against new caries lesions.¹ The same year, a separate review by O'Hagan-Wong and colleagues concluded hydroxyapatite toothpaste is an effective, biocompatible option for caries prevention in its own right.²

The most relevant adult data comes from an 18-month double-blinded randomised trial published in 2023, comparing a fluoride-free hydroxyapatite toothpaste against a standard 1,450ppm fluoride toothpaste in 171 adults. On the trial's primary endpoint, 60.7% of the hydroxyapatite group had no increase in decayed, missing or filled surfaces over the 18 months, compared with 57.5% of the fluoride group — meeting the trial's pre-set bar for non-inferiority.³ A 2025 systematic review and meta-analysis reached a similar conclusion from the pooled evidence: no statistically significant difference between hydroxyapatite and fluoride toothpastes for preventing or remineralising early caries lesions.⁴

What this does, and doesn't, prove

We want to be precise about this rather than oversell it. These are mostly non-inferiority trials — smaller sample sizes and shorter follow-up periods than the many decades of research behind fluoride. The honest reading of the evidence is "comparable," not "proven superior," and we're not claiming the latter. Fluoride toothpaste remains the position recommended by major dental bodies, including the Australian Dental Association, and nothing here is meant to argue otherwise.

What the trials do show is that choosing hydroxyapatite over fluoride isn't a leap of faith or a wellness-trend substitute — it's a choice with real, published, peer-reviewed clinical evidence behind it, for people who'd prefer a fluoride-free option for any reason.

Why we chose it

Our tooth powder uses non-nano hydroxyapatite sourced as naturally-occurring micro-particles, not the lab-engineered nano form some brands use. It's the ingredient that already exists in nature doing the job it already does in your mouth, rather than one made in a lab to imitate a different mineral's effect. Given a genuine, evidence-backed choice, that's the one we'd rather formulate with.