The Fluoride Debate: What Experts Actually Think
For something most of us barely think about twice a day, toothpaste has become unexpectedly political.
Once upon a time, choosing one meant deciding between mint flavours or whether you fancied whitening. Now, the oral care aisle feels more like a wellness battleground. Fluoride-free formulations sit beside sleek hydroxyapatite tubes, “natural” alternatives and quietly persuasive claims about toxins, remineralisation and microbiome-friendly brushing.
On one side, fluoride is framed as one of public health’s biggest success stories. On the other, there are growing questions around long-term exposure, water fluoridation and whether there are newer, biologically aligned alternatives worth considering.
So, what should we actually think?
To move beyond internet opinion and wellness whisperings, we spoke to a biological dentist, a functional practitioner and the founder of one of the UK’s newer oral wellness brands to understand where the science stands, where the legitimate questions lie, and whether the fluoride debate is really as black and white as it’s often made out to be.
First things first: does fluoride work?
The short answer? Yes. Despite the growing conversation around alternatives, all of the experts we spoke to agreed on one thing: fluoride is effective at reducing tooth decay. “Fluoride is effective at reducing caries (tooth decay), and we have long had solid evidence on this,” says functional practitioner Dr Pippa Nicholls. “But as with many things in health, the full picture is more nuanced than the headlines suggest.”
Fluoride works primarily through a topical action on the enamel, helping teeth resist acid damage and supporting remineralisation. In simple terms, it helps strengthen enamel and makes teeth more resilient against the daily wear and tear of bacteria, sugar and acidic foods.
This is why fluoride remains the conventional gold standard in dentistry, particularly in populations with higher cavity risk. But according to biological dentist Dr Seb Lomas, the bigger question is not simply “Does fluoride work?” but “What else is going on?”
“What drew me into biological dentistry was pattern recognition,” he explains. “I kept seeing patients where the dental issue wasn’t isolated. It linked to breathing, sleep, inflammation, nutrition, and how their body was functioning as a whole.”
His philosophy, he says, is rooted in looking at the mouth as part of a wider system rather than in isolation.
“That lens changes how you view fluoride,” he explains. “It becomes less about being for or against it, and more about context, individual risk and the bigger biological picture.”
Why has fluoride become controversial?
Part of the issue is that the conversation has become strangely tribal.
“The biggest misconception on both sides is that it’s a black-and-white issue,” says Dr Lomas. “Some people think fluoride is either completely essential or completely harmful. The reality is more nuanced.”
For some practitioners, the discussion is less about whether fluoride works and more about how much exposure makes sense, particularly when fluoride can come from multiple places including toothpaste, tap water, processed foods and tea.
Dr Nicholls points to water fluoridation as one area where legitimate debate exists.
“There are many arguments around water fluoridation,” she explains, “the main one being ethical, as it is mass medication without full consent.” While fluoride’s benefit is largely topical, some question whether widespread systemic exposure is necessary if the mechanism of action happens on the teeth themselves.
Still, context matters.
“For most people going about their daily lives, fluoride exposure through toothpaste or tap water is unlikely to be cause for alarm,” says Dr Nicholls. “Brushing your teeth and spitting out the toothpaste is very unlikely to cause harm, and typical UK tap water is within safe guidelines.”
Where more caution enters the conversation is with children, who are more likely to swallow toothpaste while teeth are developing, potentially increasing the risk of fluorosis, small white markings that can appear on enamel.
Enter hydroxyapatite
If fluoride is the old guard, hydroxyapatite is the ingredient increasingly stepping into the spotlight.
Originally developed in Japan, hydroxyapatite has gained momentum in wellness circles as a fluoride alternative, appearing in sleek tubes and minimalist bathrooms at an alarming rate.
But what actually is it?
Hydroxyapatite is the mineral your teeth are naturally made from. Nano-hydroxyapatite, its smaller, more reactive form, is designed to bind to enamel and help replenish weakened areas over time.
Joe Jones, founder of Nura toothpaste, says his interest came from questioning why oral care had remained relatively unchanged for decades.
“Fluoride-based formulations have dominated for 75 years with remarkably little innovation,” he says. “When I first came across nano-hydroxyapatite, the logic felt immediately compelling: rebuilding teeth with the very mineral they’re already made from.” According to Jones, the science around hydroxyapatite is stronger than many people realise, with emerging research suggesting it may perform similarly to fluoride for cavity prevention in some contexts.
But experts are careful not to frame it as a miracle replacement.
“Hydroxyapatite is a well-evidenced alternative,” says Dr Nicholls, “but people still need a plan to reduce caries risk and keep their mouth healthy and stable.”
In other words: no toothpaste, fluoride or otherwise, can out-brush poor habits.
The part everyone skips over
Interestingly, the biggest area of agreement among all the experts had very little to do with toothpaste at all. Because according to them, cavities are very rarely caused by a fluoride deficiency.
“Caries is not a fluoride deficiency,” says Dr Nicholls. “It is caused by multiple factors: sugar, an imbalanced microbiome, mouth breathing and ineffective cleaning.”
Dr Lomas agrees. For enamel health and cavity prevention, his focus is on supporting the environment where teeth can maintain themselves.
That means paying attention to saliva, which he calls the body’s “natural remineralisation system”, alongside hydration, nasal breathing and reducing mouth dryness. It also means thinking about frequency rather than perfection. Regular exposure to sugar and acidic foods matters more than the occasional indulgence.
Then there’s biofilm control, less glamorous but arguably more important than whichever toothpaste sits by your sink. Gentle, consistent brushing at the gumline, flossing or interdental cleaning remain non-negotiables.
Nutrition matters too. Dr Nicholls highlights the role of vitamins A, D and K2 in helping direct minerals throughout the body and support strong teeth, while diet quality influences the oral microbiome.
So, should you ditch fluoride?
The answer, perhaps frustratingly, is: it depends. “If someone has high cavity risk, poor diet control or reduced saliva flow,” says Dr Lomas, “fluoride may be a helpful part of their care plan.”
But for someone with good oral hygiene, stable diet, healthy saliva function and low cavity history, the conversation can become more personalised. His position is not to push fluoride or remove it entirely, but to help patients understand the benefits, limitations and alternatives. Which perhaps sums up the fluoride debate better than anything else.
This is not a story about one side being right and the other catastrophically wrong. It is a reminder that health is rarely binary. Fluoride works. The evidence says so. But there is also space for thoughtful questions about cumulative exposure, individual biology and whether emerging alternatives deserve a seat at the table.
Perhaps the real shift happening in oral wellness is not fluoride versus fluoride-free at all.
It is moving away from blind habit and towards informed decision-making, asking not just what’s in the tube, but what kind of oral environment we are creating in the first place.
Words by Eleanor Hoath for The Well Edit. Experts: Dr Pippa Nicholls and Dr Seb Lomas
The content published by The Well Edit is for informational and educational purposes only. It is not intended as, and should not be relied upon as, a substitute for professional medical, health, nutritional, legal, or financial advice. While articles may reference insights from qualified practitioners or experts, the views expressed are their own and do not necessarily reflect the views of The Well Edit. Always seek the guidance of a qualified professional before making changes to your diet, lifestyle, supplementation, or healthcare routine.
Use of any information provided is at your own discretion and risk.