We sell fluoride-free toothpaste, so you are entitled to discount our answer to this question. Which is exactly why we are going to answer it the way we would in the chair, including the parts that do not help us commercially. The honest answer is: it depends completely on what is in the tube instead of fluoride, and a large proportion of the fluoride-free products on sale would not pass that test.
The answer in three sentences
A fluoride-free toothpaste built around a genuine active at a meaningful concentration — hydroxyapatite being the one with the best clinical file — has real evidence behind it, including two randomised trials that found it non-inferior to standard fluoride toothpaste in the populations tested. A fluoride-free toothpaste that is simply fluoride-free, with no substantive active, is a flavoured abrasive and you should not expect it to protect you from decay. UK public health guidance still recommends fluoride toothpaste, and if you have a history of frequent decay, that recommendation deserves serious weight in your decision.
Everything below is the working behind those three sentences.
What UK guidance actually says
The government's Delivering Better Oral Health prevention toolkit advocates toothpaste containing 1,350 to 1,500 ppm fluoride for people aged seven and over, with lower thresholds specified for younger children. NHS guidance for adults says at least 1,350 ppm. This is the mainstream position and we are not going to spin it.
The toolkit also makes an observation that is directly relevant to this question: a substantial share of the toothpastes now available contain no fluoride, and may therefore offer no protection against decay. Note the precision of that concern. It is not aimed at hydroxyapatite; it is aimed at the large tail of products that removed something and put nothing in its place.
And the same document tells dental professionals to "explore with patients what toothpastes they are using and why, in order to assist them in selection of an appropriate product". That is a mandate for a conversation, not for a lecture — and it is the position we work from.
The evidence for the fluoride-free option that works
Three pieces of research carry most of the weight here.
An 18-month randomised trial in adults. Paszynska and colleagues, Frontiers in Public Health, 2023: a double-blinded, randomised, active-controlled non-inferiority trial, 189 adults in the intention-to-treat analysis, comparator 1,450 ppm sodium fluoride toothpaste. Over 18 months, 89.3 per cent of the hydroxyapatite group and 87.4 per cent of the fluoride group showed no increase in DMFS, and the non-inferiority margin was met.
A one-year randomised trial in children. Paszynska and colleagues, Scientific Reports, 2021: 207 children in the intention-to-treat analysis, 336 days, primary teeth, fluoride toothpaste as the control. New lesions at ICDAS code 1 or above appeared in 72.7 per cent of the hydroxyapatite group and 74.2 per cent of the fluoride group. Non-inferior to the fluoride control.
A meta-analysis of 44 trials for sensitivity. Limeback, Enax and Meyer, Biomimetics, 2023: hydroxyapatite significantly reduced dentine hypersensitivity versus placebo and versus fluoride in the pooled analysis of 44 human clinical trials.
That is a genuinely respectable evidence base for an ingredient most people had not heard of five years ago. It is why we were willing to build a range around it, and it is why the answer to the headline question is not simply "no".
Now the caveats, properly
If we stopped there, we would be doing the thing we criticise other people for. So:
Non-inferiority is not superiority. "Not worse than, within a pre-agreed margin" is a meaningful finding. It is not "better than", and anyone presenting it that way is overreaching.
The trials tested specific formulations. Those results belong to the products and concentrations tested, against the comparators named. They do not automatically extend to every hydroxyapatite toothpaste, and certainly not to a product with 1 per cent hydroxyapatite and a nice label.
Fluoride's evidence base is much larger. Decades of data across whole populations is a different order of evidence from two trials and a meta-analysis. Both can be true at once: hydroxyapatite has good evidence, and fluoride has more of it.
Individual risk changes the calculation. Someone who has had multiple new cavities in the last few years is in a different position from someone with a stable mouth and no restorations for a decade. Population averages do not tell you which you are. Your dentist can.
No toothpaste is doing this alone. In the children's trial, most children in both groups still developed new early lesions. Toothpaste is one input among diet frequency, plaque control, saliva, genetics and time.
The question underneath the question
Most people asking "is fluoride-free toothpaste effective" are really asking one of two things.
"Will my teeth be worse off if I switch?" If you switch to a well-formulated hydroxyapatite toothpaste at a real concentration, keep brushing twice daily, keep cleaning between your teeth and keep your check-ups, the evidence suggests you are not making a reckless decision. If you switch to something with no meaningful active, or if you switch and simultaneously get sloppier about everything else, that is a different situation.
"Is fluoride harmful?" Not according to UK health guidance, which recommends it. We are not going to tell you otherwise, and we would be sceptical of any retailer that did — it is generally a sign that the product cannot be sold on its own merits. Our range exists because some people prefer to avoid fluoride, not because fluoride is a danger to be escaped.
Who we would and would not steer towards fluoride-free
Being useful means being willing to say "not you".
Fluoride-free is a reasonable choice if: you have a stable dental history, you are motivated about the basics, sensitivity is your main complaint, you have a strong personal preference to avoid fluoride, and you keep regular check-ups so anything developing is caught early.
We would encourage a proper conversation with your own dentist first if: you have had several new cavities recently, you have extensive restorations, you have a dry mouth from medication or treatment, you have orthodontic appliances, or you are choosing on behalf of a child. In those situations the higher-evidence option may genuinely be the better one for you, and no product page can assess that.
That is not a disclaimer. It is the actual advice.
If you do switch, do it properly
Choose a product that names its active and states its concentration. Keep spitting rather than rinsing so the paste stays in contact with the teeth. Clean between your teeth daily — this matters more than the toothpaste debate, and it is where most people's real gains are available. Give it six to eight weeks before judging. And tell your dentist, so it can be part of your risk assessment rather than a surprise.
The Onyx care guide sets out the whole routine, and the full range is small enough to read in a couple of minutes.
Our answer, and what to do with it
Yes, a well-formulated fluoride-free toothpaste can be effective — and no, most of the fluoride-free market is not well formulated. That is the whole answer. If you want to try the version with evidence behind its active, Biorepair Plus Total Protection at £6.99 lists 20% microRepair® hydroxyapatite, and Biorepair Plus Sensitive Teeth lists 24% at the same price for anyone whose main issue is cold-triggered discomfort. One tube is a small, reversible experiment — and if your dentist advises you to stay with fluoride, take their advice over ours.
Sources
- GOV.UK — Delivering better oral health: chapter 9, Fluoride
- NHS — How to keep your teeth clean
- Paszynska et al., 18-month adult randomised non-inferiority trial, Frontiers in Public Health (2023)
- Paszynska et al., 1-year children's randomised trial, Scientific Reports (2021)
- Limeback, Enax & Meyer, meta-analysis of 44 clinical trials, Biomimetics (2023)
- Xu et al., Advanced materials for enamel remineralization, Frontiers in Bioengineering and Biotechnology (2022)
- Biorepair — microRepair® concentrations in Biorepair toothpastes