Hydroxyapatite Toothpaste vs. Fluoride: Which Is Better?

Hydroxyapatite (hi-DROX-ee-AP-uh-tite), often shortened to HAP, is moving from niche brands to mainstream ones. In September 2026, Tom’s of Maine, a brand owned by Colgate-Palmolive, launched a fluoride-free hydroxyapatite toothpaste, saying it was responding to rising demand for fluoride-free products (Tom’s of Maine, 2026).

So is it a real alternative to fluoride, or good marketing? This article covers what hydroxyapatite is, what the head-to-head trials found and who paid for them, what it can do for enamel, sensitivity and whitening, whether it’s safe, and how to choose a toothpaste.

What is hydroxyapatite toothpaste?

Hydroxyapatite is the main calcium phosphate mineral in teeth and bones (Limeback et al., 2021). Toothpastes use a lab-made version of it. You’ll see it on labels as hydroxyapatite, nano-hydroxyapatite (nano-HAP, very small particles) or microcrystalline hydroxyapatite (larger particles), usually at around 10% of the paste in the products tested in trials (Paszynska et al., 2021; Paszynska et al., 2023).

The idea is that the particles stick to the tooth surface, fill tiny defects and supply calcium and phosphate, the building blocks enamel uses to repair early damage. Much of the support for these mechanisms comes from laboratory studies (Limeback et al., 2021; Wierichs et al., 2022).

Is hydroxyapatite toothpaste FDA approved or ADA accepted?

Hydroxyapatite toothpastes were first sold in Japan in the 1980s (Limeback et al., 2021), and Japan approved hydroxyapatite as an anti-cavity ingredient in 1993 (Paszynska et al., 2021). In the United States, the FDA’s rules for over-the-counter “anticavity” toothpaste list only three active ingredients, all of them fluorides: sodium fluoride, sodium monofluorophosphate and stannous fluoride (U.S. Food and Drug Administration, 2026). So a hydroxyapatite toothpaste can’t carry an FDA-recognized anticavity claim, and the ADA Seal of Acceptance for cavity protection also requires fluoride (American Dental Association, 2026).

How does fluoride protect your teeth?

Brushing with fluoride toothpaste is the main way to prevent tooth decay (caries) at home. A Cochrane review of 96 trials found that it prevents more cavities than non-fluoride toothpaste in children, teenagers and adults, with moderate- to high-certainty evidence for the most common strengths (Walsh et al., 2019).

Fluoride helps enamel take back lost minerals and makes it more resistant to acid. For the basics, see the guide to fluoride and how it works. The main downside is fluorosis: swallowing too much fluoride while teeth are forming can leave white flecks or streaks on the teeth, which is why young children use only a small amount (American Dental Association, 2026).

Hydroxyapatite toothpaste vs. fluoride: which prevents cavities?

Hydroxyapatite may help prevent cavities, but the evidence is much thinner than for fluoride. Three randomized trials have compared fluoride-free hydroxyapatite toothpaste head to head with fluoride toothpaste, all designed to test whether hydroxyapatite was “not worse” (non-inferior) by a set margin, not whether it was better.

Trial	Who finished the trial	How long	Comparison	What happened
Paszynska et al., 2021	177 children aged 3–7 in Poland	About 1 year	10% hydroxyapatite vs. 500 ppm fluoride	New or worsening early decay in 72.7% vs. 74.2%
Paszynska et al., 2023	171 adults aged 18–45 in Poland, mostly young and at low risk	18 months	10% hydroxyapatite vs. 1,450 ppm fluoride	No new decay in 89.3% vs. 87.4%
Schlagenhauf et al., 2019	133 people aged 11–25 with braces and high cavity risk in Germany	6 months	10% hydroxyapatite vs. 1,400 ppm fluoride	New early lesions in 54.7% vs. 60.9%

In each trial, the hydroxyapatite toothpaste met the researchers’ test for being not worse than fluoride, and none showed that it was better (Paszynska et al., 2021; Paszynska et al., 2023; Schlagenhauf et al., 2019).

Why these results need careful reading

• Who paid for them. All three trials were funded by Dr. Kurt Wolff GmbH & Co. KG, the German company that makes the Karex toothpaste tested (the adult trial was co-funded by two Polish universities), and three authors of the adult trial work for the company (Paszynska et al., 2021; Paszynska et al., 2023; Schlagenhauf et al., 2019).
• Brushing conditions. Participants used electric toothbrushes, and in the children’s trial parents brushed for them twice a day, with a third supervised brushing at midday (Paszynska et al., 2021).
• The comparison. The children’s trial compared hydroxyapatite with a low-strength (500 ppm) fluoride children’s toothpaste (Paszynska et al., 2021).
• A changed goal. The braces trial changed its main outcome partway through, after a blinded look at the data, and both groups also had an antiseptic gel applied at checkups (Schlagenhauf et al., 2019).
• Few cavities to compare. In the adult trial, nearly 9 in 10 people in both groups had no new decay, so there was little room to show a difference. The authors themselves describe their volunteers as healthy, mostly young adults without significant oral health problems (Paszynska et al., 2023).

What do independent reviews say?

Reviews disagree, partly along funding lines. A review co-authored by two scientists from the same company concluded that hydroxyapatite is effective against cavities without fluoride (Pawinska et al., 2024).

Reviewers without that link reach mixed conclusions. A University of Bern team looked at 10 clinical and in-mouth studies of nano-hydroxyapatite, rated the evidence very low certainty, noted that six studies were funded or published by the products’ makers, and concluded that the evidence was not conclusive (Wierichs et al., 2022). A 2025 review led by a University of Athens team, covering four trials in people under 25, found no significant difference between hydroxyapatite and fluoride toothpaste in new or worsening decay (risk ratio 0.98; 95% confidence interval 0.85 to 1.12), and called hydroxyapatite a promising alternative, but it rested on only four small studies (Chatzidimitriou et al., 2025).

A 2026 review of 122 studies of fluoride-free toothpastes found that the evidence was mostly laboratory and mechanistic research, and only 20 studies gave direct evidence in children. Hydroxyapatite had the most consistent evidence of any fluoride-free ingredient, but the authors concluded that no fluoride-free option yet has evidence comparable to fluoride for preventing cavities in children over the long term (Wong & Donnell, 2026).

Can hydroxyapatite repair enamel?

Hydroxyapatite can help early decay, the chalky white spots where enamel has lost minerals but has no hole yet, take minerals back, at least in short studies. In one study, 30 adults wore mouth appliances holding small blocks of baby-tooth enamel with artificial early decay. After 14 days of brushing, a 10% hydroxyapatite toothpaste and a 500 ppm fluoride toothpaste restored similar amounts of mineral (Amaechi et al., 2019).

There’s a catch. In in-mouth studies that tested conditions favoring mineral loss, fluoride slowed the damage but nano-hydroxyapatite did no better than a toothpaste with neither ingredient (Wierichs et al., 2022). For what early repair can and can’t do, see whether a cavity can heal on its own. Wondering about hydroxyapatite and peptide serums? See whether enamel repair serums work.

Is hydroxyapatite toothpaste good for sensitive teeth?

This is where hydroxyapatite looks strongest. Tooth sensitivity happens when dentin, the layer under enamel, is exposed and its tiny tubes let cold or sweet things reach the nerve. Hydroxyapatite particles appear to plug those tubes (Limeback et al., 2023a).

• The largest analysis, 125 trials with 12,541 people, found that toothpaste combining potassium and hydroxyapatite reduced pain from touch and air compared with regular fluoride toothpaste, with moderate- to high-certainty evidence, about as well as stannous fluoride. Calcium sodium phosphosilicate had the strongest results overall (Martins et al., 2020).
• Another analysis of 30 trials ranked nano-hydroxyapatite toothpaste as the most likely to work best at 2 and 4 weeks, although it also found a significant placebo effect (Hu et al., 2019).
• A review found 44 trials of hydroxyapatite for sensitivity. Pooling 22 of them, it reported a 39.5% greater average reduction in sensitivity than placebo and 23% greater than fluoride. Two of its three authors work for a hydroxyapatite toothpaste maker, and most trials lasted 3 months or less (Limeback et al., 2023a).

The guide to tooth sensitivity covers the other options and when sensitivity needs a dentist.

Does hydroxyapatite whiten teeth?

Only weakly, as far as the evidence goes. A review of 17 studies found consistent whitening in laboratory tests on extracted or animal teeth, but the six studies in people were described as preliminary and rated from very low to moderate quality. The two double-blind trials in that review found no whitening benefit, although the review’s authors say those products contained very little hydroxyapatite. Two of the review’s three authors work for a hydroxyapatite toothpaste maker (Limeback et al., 2023b).

Hydroxyapatite doesn’t bleach teeth; the proposed effect is a thin white mineral coating (Limeback et al., 2023b). For what toothpaste can do for stains, see whether whitening toothpaste works.

Is hydroxyapatite toothpaste safe?

For everyday brushing, it appears to be. The European Commission’s Scientific Committee on Consumer Safety reviewed nano-hydroxyapatite and judged it safe at up to 10% in toothpaste and 0.465% in mouthwash. That opinion covers only rod-shaped particles that are not coated, not needle-shaped particles, and not sprays you could breathe in (Scientific Committee on Consumer Safety, 2023). The clinical trials reported no serious side effects (Paszynska et al., 2021; Paszynska et al., 2023; Schlagenhauf et al., 2019).

Is hydroxyapatite toothpaste safe for kids?

Hydroxyapatite does not cause fluorosis, which is one reason some parents choose it for toddlers who swallow toothpaste. But for children, the trade-off matters most: fluoride toothpaste has decades of evidence behind it (Walsh et al., 2019), while the evidence for fluoride-free alternatives in children is still limited (Wong & Donnell, 2026). Using the right amount of fluoride toothpaste, a rice-grain smear until age 3 and a pea-sized amount from 3 to 6, keeps fluoride intake low (American Dental Association, 2026). The parent’s guide to kids’ teeth has the details.

Can you use hydroxyapatite and fluoride together?

Yes. Some toothpastes contain both. In a 2-year trial of 610 Italian schoolchildren, toothpastes combining a specific hydroxyapatite formula with fluoride led to fewer new cavities than fluoride-only toothpastes of the same fluoride strength (Cagetti et al., 2022). That’s one trial of one formula, in children who brushed three times a day, so it needs confirming. There is no good evidence on whether alternating separate toothpastes, for example one in the morning and the other at night, adds anything.

What it means for you

If you get cavities easily

Stick with fluoride toothpaste. It has the strongest evidence (Walsh et al., 2019), and the hydroxyapatite trials were mostly in people at low risk or under unusually close supervision (Paszynska et al., 2021; Paszynska et al., 2023).

If you’d rather avoid fluoride

A hydroxyapatite toothpaste has the most consistent evidence among fluoride-free options (Wong & Donnell, 2026). Tell your dentist so they can watch for early decay and suggest extra protection if you need it. If you want a middle ground, a toothpaste with both fluoride and hydroxyapatite is an option, though only one trial has tested the combination (Cagetti et al., 2022). Some fluoride-free pastes now also advertise probiotics; see what studies show about probiotic toothpaste.

If sensitivity is your main problem

A sensitivity toothpaste with stannous fluoride or calcium sodium phosphosilicate is a well-supported first step, and one with hydroxyapatite is a reasonable alternative (Martins et al., 2020).

If you’re choosing for a young child

Fluoride toothpaste in the right amount is the best-proven option, and the evidence for fluoride-free toothpaste in children is still limited (Walsh et al., 2019; Wong & Donnell, 2026). Whatever you choose, brush twice a day, cut down on how often you have sugar, and keep up with checkups. The daily dental hygiene routine walks through each step.

Questions to ask your dentist

• Is my risk of cavities low enough to use a fluoride-free toothpaste?
• Would a toothpaste with both fluoride and hydroxyapatite make sense for me?
• Do I need extra fluoride, such as varnish at my checkups?
• Which toothpaste would you suggest for my sensitive teeth?
• How much toothpaste should my child use, and which kind?

When to see a dentist

Book a dental visit if:

• you notice white, brown or black staining on a tooth, or a hole or pit (National Institute of Dental and Craniofacial Research, 2025)
• you have toothache, or sensitivity to sweets, hot or cold, that keeps coming back or lingers (National Institute of Dental and Craniofacial Research, 2025)
• sensitivity hasn’t improved after several weeks of using a sensitivity toothpaste twice a day
• you’ve switched to a fluoride-free toothpaste and have a history of cavities, so your dentist can check your risk

Tell your dentist what toothpaste you use. It helps them decide whether you need extra fluoride, such as varnish at your checkups. Get care urgently for tooth pain with facial swelling or fever, which can signal an infection (National Institute of Dental and Craniofacial Research, 2025). See what to do in a dental emergency.

The bottom line

Hydroxyapatite toothpaste is a reasonable fluoride-free option, and a few manufacturer-funded trials found it about as good as fluoride at preventing early decay over 6 to 18 months. Most independent reviewers say that evidence is still too limited to call it equal to fluoride, which has decades of strong evidence behind it. If you’re prone to cavities, keep fluoride; if you avoid fluoride, hydroxyapatite has the most consistent evidence of the alternatives, and its strongest case is for sensitive teeth.

References

Amaechi BT, AbdulAzees PA, Alshareif DO, Shehata MA, Lima PPCS, Abdollahi A, et al. (2019). Comparative efficacy of a hydroxyapatite and a fluoride toothpaste for prevention and remineralization of dental caries in children. BDJ Open, 5, 18. https://doi.org/10.1038/s41405-019-0026-8

American Dental Association. (2026). Toothpastes. https://www.ada.org/resources/ada-library/oral-health-topics/toothpastes

Cagetti MG, Cocco F, Wierichs RJ, Wolf TG, Salerno C, Arghittu A, et al. (2022). Efficacy of HAF toothpastes in primary and permanent dentitions. A 2-years triple-blind RCT. Journal of Dentistry, 121, 104049. https://doi.org/10.1016/j.jdent.2022.104049

Chatzidimitriou K, Theodorou K, Seremidi K, Kloukos D, Gizani S, Papaioannou W. (2025). The role of hydroxyapatite-based, fluoride-free toothpastes on the prevention and the remineralization of initial caries lesions: A systematic review and meta-analysis. Journal of Dentistry, 156, 105691. https://doi.org/10.1016/j.jdent.2025.105691

Hu ML, Zheng G, Lin H, Yang M, Zhang YD, Han JM. (2019). Network meta-analysis on the effect of desensitizing toothpastes on dentine hypersensitivity. Journal of Dentistry, 88, 103170. https://doi.org/10.1016/j.jdent.2019.07.008

Limeback H, Enax J, Meyer F. (2021). Biomimetic hydroxyapatite and caries prevention: A systematic review and meta-analysis. Canadian Journal of Dental Hygiene, 55(3), 148–159. https://pubmed.ncbi.nlm.nih.gov/34925515/

Limeback H, Enax J, Meyer F. (2023a). Clinical evidence of biomimetic hydroxyapatite in oral care products for reducing dentin hypersensitivity: An updated systematic review and meta-analysis. Biomimetics, 8(1), 23. https://doi.org/10.3390/biomimetics8010023

Limeback H, Meyer F, Enax J. (2023b). Tooth whitening with hydroxyapatite: A systematic review. Dentistry Journal, 11(2), 50. https://doi.org/10.3390/dj11020050

Martins CC, Firmino RT, Riva JJ, Ge L, Carrasco-Labra A, Brignardello-Petersen R, et al. (2020). Desensitizing toothpastes for dentin hypersensitivity: A network meta-analysis. Journal of Dental Research, 99(5), 514–522. https://doi.org/10.1177/0022034520903036

National Institute of Dental and Craniofacial Research. (2025). Tooth decay. https://www.nidcr.nih.gov/health-info/tooth-decay

Paszynska E, Pawinska M, Gawriolek M, Kaminska I, Otulakowska-Skrzynska J, Marczuk-Kolada G, et al. (2021). Impact of a toothpaste with microcrystalline hydroxyapatite on the occurrence of early childhood caries: A 1-year randomized clinical trial. Scientific Reports, 11(1), 2650. https://doi.org/10.1038/s41598-021-81112-y

Paszynska E, Pawinska M, Enax J, Meyer F, Schulze zur Wiesche E, May TW, et al. (2023). Caries-preventing effect of a hydroxyapatite-toothpaste in adults: A 18-month double-blinded randomized clinical trial. Frontiers in Public Health, 11, 1199728. https://doi.org/10.3389/fpubh.2023.1199728

Pawinska M, Paszynska E, Amaechi BT, Meyer F, Enax J, Limeback H. (2024). Clinical evidence of caries prevention by hydroxyapatite: An updated systematic review and meta-analysis. Journal of Dentistry, 151, 105429. https://doi.org/10.1016/j.jdent.2024.105429

Schlagenhauf U, Kunzelmann KH, Hannig C, May TW, Hösl H, Gratza M, et al. (2019). Impact of a non-fluoridated microcrystalline hydroxyapatite dentifrice on enamel caries progression in highly caries-susceptible orthodontic patients: A randomized, controlled 6-month trial. Journal of Investigative and Clinical Dentistry, 10(2), e12399. https://doi.org/10.1111/jicd.12399

Scientific Committee on Consumer Safety. (2023). Opinion on hydroxyapatite (nano) (SCCS/1648/22). European Commission. https://health.ec.europa.eu/publications/hydroxyapatite-nano-0_en

Tom’s of Maine. (2026, September 23). Tom’s of Maine introduces hydroxyapatite toothpaste to meet rising consumer demand [Press release]. PR Newswire. https://www.prnewswire.com/news-releases/toms-of-maine-introduces-hydroxyapatite-toothpaste-to-meet-rising-consumer-demand-302887638.html

U.S. Food and Drug Administration. (2026). 21 CFR Part 355: Anticaries drug products for over-the-counter human use. Electronic Code of Federal Regulations. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-D/part-355

Walsh T, Worthington HV, Glenny AM, Marinho VC, Jeroncic A. (2019). Fluoride toothpastes of different concentrations for preventing dental caries. Cochrane Database of Systematic Reviews, 3(3), CD007868. https://doi.org/10.1002/14651858.CD007868.pub3

Wierichs RJ, Wolf TG, Campus G, Carvalho TS. (2022). Efficacy of nano-hydroxyapatite on caries prevention: A systematic review and meta-analysis. Clinical Oral Investigations, 26(4), 3373–3381. https://doi.org/10.1007/s00784-022-04390-4

Wong AJ, Donnell CC. (2026). Navigating fluoride hesitancy: Mapping the evidence base for fluoride-free toothpaste alternatives. European Journal of Pediatrics, 185(7), 507. https://doi.org/10.1007/s00431-026-07176-y

References checked October 2026 · Editorial policy · Report a correction

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