Going fluoride-free is a choice plenty of people make, and a perfectly reasonable one. The catch is the label. "Fluoride-free" tells you what a manufacturer took out of the tube and nothing about what they put in, and a toothpaste with no fluoride and no other working ingredient is really just a pleasant-tasting polish. So when someone asks us which fluoride-free toothpaste to buy, we ignore the front of the box and ask five questions. The two hydroxyapatite toothpastes we stock pass all five, and here's how to hold any other tube to the same standard.
Why people choose fluoride-free
The reasons we hear most are simple. Some people just prefer not to use fluoride. Some like the logic of brushing with the same mineral their teeth are made of. Many have sensitive teeth, which happens to be where hydroxyapatite's evidence is strongest. Whatever brought you here, the aim is the same: replace fluoride with something that does a job.
The five-question test
Run any fluoride-free toothpaste through these before you buy it. If it fails two, put it back on the shelf.
1. Is the active named?
Not "natural minerals" or a "plant-powered complex". One named ingredient that is there to do something. Hydroxyapatite appears on labels as hydroxyapatite, hydroxylapatite, nano-hydroxyapatite or zinc hydroxyapatite. Biorepair calls its version microRepair®, a zinc-substituted carbonate hydroxyapatite, and tells you so.
2. How much of it is there?
This is where most of the market goes quiet. Hydroxyapatite at 1% and at 20% are different products, and a brand that names the ingredient without giving a number is usually naming it for the label. Look for a figure in mg/g or per cent. Biorepair publishes 240 mg/g (24%) for Plus Sensitive Teeth and 200 mg/g (20%) for Plus Total Protection.
3. Has it been tested in people?
Laboratory chemistry is a start; mouths are the real test. Ask what the ingredient was compared with, and for how long. Holding its own against a 1,450 ppm fluoride toothpaste for 18 months is a high bar. Beating a placebo for a fortnight is a low one.
4. Does the brand tell you what it can't do?
We trust brands that draw their own lines. Biorepair describes microRepair® as forming a temporary coating over micro-scratches with twice-daily use, "but not carious lesions or chipped teeth". A company that tells you where its product stops is one we believe about the rest.
5. Will you actually use it twice a day?
Taste, texture and price matter more than anyone admits. The cleverest toothpaste in the world does nothing in the cupboard, and an expensive tube you ration loses to a £6.99 one you use properly.
What the evidence says about hydroxyapatite
Your enamel is 96 to 97 per cent mineral by weight, and that mineral is hydroxyapatite. A hydroxyapatite toothpaste puts the same material back on the tooth surface, where the particles settle into microscopic scratches and early weak spots and act as a local store of calcium and phosphate. That is what "biomimetic" means when it is used properly: not a substitute chemistry, just more of what your teeth are already made of.
The clinical record is the reason we stock it.
| Study | Design | Compared with | Result |
|---|---|---|---|
| Paszynska and colleagues, 2023 | 18-month double-blind randomised trial, 189 adults | 1,450 ppm fluoride toothpaste | No new decayed, missing or filled surfaces in 89.3% of the hydroxyapatite group and 87.4% of the fluoride group: no worse than fluoride |
| Paszynska and colleagues, 2021 | One-year double-blind randomised trial, 207 young children | 500 ppm children's fluoride toothpaste | Early decay progressed in 72.7% of the hydroxyapatite group and 74.2% of the fluoride group: no worse than fluoride |
| Limeback, Enax and Meyer, 2023 | Meta-analysis of 44 clinical trials | Placebo, fluoride and other desensitisers | Reduced sensitivity significantly more than placebo and more than fluoride |
The decay trials tested a 10% formula made by Dr. Kurt Wolff, the German company behind Karex toothpaste, which also funded them, and "no worse than fluoride" is the finding rather than "better"; even so, that is a strong clinical record for any fluoride-free active.
What we stock, and why
We carry two fluoride-free toothpastes, both from Biorepair's Plus range, because they pass all five questions at a price you can keep paying.
Biorepair Plus Sensitive Teeth (£6.99, 75 ml) has the higher concentration, 24% microRepair®, and it is the one we suggest to anyone who winces at a cold drink. Biorepair Plus toothpaste has its own trials for sensitivity, too: two double-blind randomised studies, both included in that 44-trial meta-analysis and both graded high quality by its reviewers.
Biorepair Plus Total Protection (£6.99, 75 ml) is the everyday tube at 20% microRepair®, for anyone who simply wants a fluoride-free toothpaste with something real in it. Once you've found your tube, Subscribe and Save 10% brings either one to £6.29, delivered every four or eight weeks.
Families ask us about children too. NHS advice for children is built around fluoride toothpaste in age-appropriate amounts; for parents who prefer fluoride-free, Biorepair states that children under six can use its toothpaste without adult supervision, and Total Protection is the everyday tube we suggest. You'll find both tubes in our fluoride-free toothpaste and hydroxyapatite toothpaste collections, and our Sensitive Teeth vs Total Protection comparison will help you pick in about a minute.
How to switch
Change one thing at a time. Swap the tube, keep your brushing and your cleaning between the teeth exactly as they are, and give it six to eight weeks, roughly two tubes, before you judge it. Spit after brushing rather than rinsing, so the paste stays on your teeth.
If your brush is part of the story, this is a good moment to look at it too. Brushing too hard is behind a lot of sensitivity, and the Oral-B iO9 shows you the moment you press too hard. For the full research, read our hydroxyapatite toothpaste guide; for the rest of the label, toothpaste ingredients explained.
Why buy from Onyx
Every product we sell was chosen by practising dentists, and our toothpaste shelf is short because these five questions are hard to pass. If you're upgrading your brush at the same time, our Complete Care Bundles put the iO9, four iO Ultimate Clean heads and your choice of tube together for £180, £11.98 less than buying them separately. Order before 4pm and it leaves the same day, delivery is free on UK orders over £50, unopened items can come back within 30 days, and if you have a question before or after you buy, email hello@onyx-dental.co.uk and one of our dentists will reply.
Sources
- Paszynska and colleagues: 18-month trial in adults, Frontiers in Public Health (2023)
- Paszynska and colleagues: one-year trial in children, Scientific Reports (2021)
- Limeback, Enax and Meyer: meta-analysis of 44 trials on sensitivity, Biomimetics (2023)
- Xu and colleagues: materials for enamel remineralisation, Frontiers in Bioengineering and Biotechnology (2022)
- Biorepair: microRepair® enamel care, microRepair® concentrations and use by children under six
- NHS: taking care of children's teeth