It often starts small: the biting edges look slightly translucent in the light, the tooth looks more yellow than it used to, and iced water suddenly feels unpleasant. If you then search for “rebuilding tooth enamel”, you’ll find promises of repair and restoration. The honest answer is a bit more sober – and still good news.

It can’t grow back. But it can take up minerals again.

Tooth enamel is the hardest substance in your body and at the same time the only one that doesn’t renew itself. It contains no living cells. Once it’s worn away, the body doesn’t regrow it – unlike bone, which remodels.

What does happen, every day and in both directions: minerals move out of the tooth surface and back in again. Acid from food, drinks and the metabolism of oral bacteria dissolves calcium and phosphate out of it. Your saliva brings both back. When the return outweighs the loss, it’s called remineralisation. This balance is the point where you can make a difference.

Why hydroxyapatite of all things

Your tooth enamel is around 97 per cent hydroxyapatite, a compound of calcium and phosphate. This very mineral is also in our tooth powder – the same building block the surface is made of anyway. It supports the natural remineralisation of tooth enamel and contributes to smoothing the tooth surface. A smoother surface looks brighter because it reflects light more evenly – entirely without bleaching agents.

Our tooth powder contains no nano particles. We explain what’s behind the nano question in detail in the article Safety of nano-hydroxyapatite.

Dentafari Starter Set – 100 g tooth powder refill with hydroxyapatite and amber glass jar
Getting started
Hydroxyapatite Tooth Powder – Starter Set with Amber Glass Jar

One flavour of your choice together with the amber glass jar and aluminium screw lid. All three flavours contain hydroxyapatite, which supports the natural remineralisation of tooth enamel. No nano particles. Mineral · With plant-based ingredients · Refillable · Tooth powder made in Germany.

Already have a jar? You’ll find all flavours and sizes in the tooth powder overview.

The biggest lever isn’t the product

As much as we’d like to tell it differently: what helps your tooth enamel most comes down to two habits, not a purchase.

The first is patience after acidic food and drink. Fruit, juice, wine, soft drinks and even yoghurt lower the pH in your mouth and soften the surface for a while. If you brush straight afterwards, you wear away more than usual at exactly that moment. Waiting half an hour is enough – by then your saliva has rebalanced the environment.

The second is pressure. A soft brush, small calm movements, and a hand that holds back. Hard scrubbing feels thorough but costs substance that doesn’t come back. Xylitol, which is in our flavours, supports a less acidic, balanced oral environment.

What the studies say – and what you make of it

Fluoride is the longest and most extensively studied active ingredient in oral care. Dental societies in Germany recommend fluoride toothpaste, and that’s the baseline every alternative has to be measured against. Hydroxyapatite is a younger field of research. In recent years, however, it has been compared directly with fluoride in several clinical studies.

In a study with 207 children aged three to seven, one group brushed for almost eleven months with a hydroxyapatite toothpaste, the other with a children’s toothpaste containing 500 ppm fluoride. The proportion of children who developed new caries lesions was at a comparable level in both groups [1]. In 189 adults aged 18 to 45, a similar picture emerged over 18 months: in 89 per cent of the hydroxyapatite group and 87 per cent of the fluoride group with 1,450 ppm, no new caries lesions appeared [2]. In teenagers with fixed braces, whose enamel is under particular strain, hydroxyapatite also performed no worse than the fluoride comparison group over six months [3]. A 2024 review summarising 13 studies concludes that hydroxyapatite was comparably effective to fluoride in these studies [4].

An honest assessment includes two things. Most of these studies were carried out with the toothpastes of one particular manufacturer, and several of the authors work for that manufacturer. And their results apply to the products studied, not automatically to every oral care product with hydroxyapatite – including ours. What the research shows is therefore not a verdict against fluoride, but that there is more than one well-studied path.

Which one suits you is your decision. We give you transparency about what’s inside, and no number that promises more than it can deliver. We’ve gathered the studies in detail in Hydroxyapatite or fluoride? What the studies say, and the basics of the mineral itself are in Hydroxyapatite in oral care: 5 things you should know.

What many people also ask

Can tooth enamel grow back?
No. Tooth enamel contains no living cells, so the body doesn’t regrow it. What is possible is remineralisation: minerals are redeposited in the existing surface.

What does remineralisation mean?
Your saliva constantly releases calcium and phosphate to the tooth surface and takes them up again. When uptake outweighs loss, it’s called remineralisation. Hydroxyapatite supplies exactly these building blocks and supports the natural process.

How do I notice that my tooth enamel is getting thinner?
Common signs are teeth that look translucent at the biting edges, a more yellow colour because the dentine beneath shows through, and greater sensitivity to cold or sweet things. Only a dental practice can clarify this.

What harms tooth enamel most in everyday life?
Acid and mechanical wear. Acidic drinks briefly soften the surface; hard scrubbing wears it away. Wait half an hour after acidic food or drink before brushing, and use a soft brush with little pressure.

Do I need fluoride for this?
Fluoride is the longest-studied active ingredient and is recommended by dental societies. Hydroxyapatite has been compared with fluoride in several clinical studies and performed comparably there. Which oral care suits you is your decision.

How long does it take for something to change?
Remineralisation is a slow, daily process, not an event. What matters is less the individual product than regularity over weeks and months.

If you like, start this evening: soft brush, little pressure, and half an hour’s pause after juice. Our tooth powders with hydroxyapatite are there with you along the way.

Your new oral care starts here.

Start with the Starter Set: one flavour of your choice and the amber glass jar that stays. Mineral · With plant-based ingredients · Refillable · Tooth powder made in Germany.

Shop the Starter Set →

Sources

  1. Paszynska E et al. (2021): Impact of a toothpaste with microcrystalline hydroxyapatite on the occurrence of early childhood caries: a 1-year randomized clinical trial. Sci Rep 11:2650. https://doi.org/10.1038/s41598-021-81112-y
  2. Paszynska E et al. (2023): Caries-preventing effect of a hydroxyapatite-toothpaste in adults: a 18-month double-blinded randomized clinical trial. Front Public Health 11:1199728. https://doi.org/10.3389/fpubh.2023.1199728
  3. Schlagenhauf U 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. J Investig Clin Dent 10(2):e12399. https://doi.org/10.1111/jicd.12399
  4. Pawinska M et al. (2024): Clinical evidence of caries prevention by hydroxyapatite: an updated systematic review and meta-analysis. J Dent 151:105429. https://doi.org/10.1016/j.jdent.2024.105429