The short version
- The 2024-2025 fluoride fight is about drinking-water dose. The federal IQ findings apply above 1.5 mg/L, twice the US fluoridation level, and say nothing about toothpaste you spit out.
- Fluoride toothpaste has Cochrane-grade evidence behind it, which almost nothing in consumer health can claim.
- Hydroxyapatite is genuinely promising, decades old in Japan, and running on a much younger, largely industry-adjacent trial record.
- Charcoal toothpaste scratches enamel and whitens nothing. That one's not a debate.
Utah shut off its fluoride pumps on May 7, 2025. Florida followed on July 1. Somewhere in the resulting noise, a lot of people looked sideways at a tube of Crest that had done nothing wrong. If the water fight has you rethinking your toothpaste, the good news is that the two questions barely touch.
The water fight is a dose fight
Here's what actually happened, stripped of both panic and eye-rolling. In August 2024, the National Toxicology Program published a systematic review concluding, with moderate confidence, that fluoride exposure above 1.5 milligrams per liter of drinking water is associated with lower IQ in children. That's more than twice the 0.7 mg/L used in US community fluoridation, and the report itself said it couldn't establish anything about effects at the US level.
A month later, a federal judge in California ordered the EPA to take regulatory steps to further assess fluoridation's risk under the Toxic Substances Control Act, while stating that his ruling did not conclude fluoridated water harms public health. Then came the state bans: Utah first, Florida second, both in 2025.
You can hold whatever view you like about putting fluoride in water, where the dose arrives all day, every day, in everything you drink, and babies get it in formula. Toothpaste is a different exposure problem entirely: a pea-sized topical application that you spit out. The NTP monograph is not about your bathroom.
Fluoride toothpaste has the receipts
Few things you can buy at a drugstore carry evidence like this. A 2019 Cochrane review of nearly a hundred randomized trials found high-certainty evidence that toothpaste at 1,000 to 1,500 ppm fluoride prevents cavities compared with non-fluoride paste. That sits on top of half a century of trials, tens of thousands of participants, and a mechanism that's well understood: fluoride helps rebuild dissolving enamel into a more acid-resistant mineral, working at the tooth surface rather than from inside the body.
The regular tube at any American drugstore falls in that range, and price has nothing to do with it. The $2 tube carries the same active ingredient, at the same evidence-backed concentration, as the $12 one with the Scandinavian typeface.
The legitimate caveat involves small children, who swallow toothpaste because it tastes like candy and they are small children. Too much swallowed fluoride while adult teeth are forming can cause fluorosis, which is usually a cosmetic mottling, not a health harm. It's why the standard guidance is a rice-grain smear under age three and a pea-sized dab from three to six. Managed that way, fluoride paste is boring, cheap, and extremely well proven.
The challenger has been quietly working since 1980
Hydroxyapatite isn't a wellness invention. It's the mineral your enamel is mostly made of, and the idea of brushing with it is that you're resupplying the construction site directly. Japan's Sangi Company launched the first hydroxyapatite toothpaste in 1980 and the Apagard brand in 1985, and Japanese regulators approved the ingredient as an anti-cavity active in 1993. Tens of millions of tubes later, this is not an untested substance.
The modern trials are genuinely encouraging. An 18-month randomized trial in adults found a hydroxyapatite paste non-inferior to 1,450 ppm fluoride toothpaste for preventing cavities, and a year-long trial in young children found caries outcomes similar to fluoride paste. Reviews of the remineralization data keep coming back positive.
Now the honest asterisks. The trial record is a fraction of fluoride's size, the studies are smaller and shorter, and a fair share involve funding or authors connected to companies selling the ingredient. That doesn't make the results wrong. It makes them young. Fluoride cleared this same bar decades ago, then kept clearing it for fifty years. Hydroxyapatite is maybe two lengths into that race, running well.
One point where the swallowing logic flips: hydroxyapatite is the same mineral your enamel is made of, so a toddler gulping the paste is a non-event. That's precisely why it appeals to parents of dedicated paste-eaters.
The shelf, graded
| Option | The evidence | Our take |
|---|---|---|
| Fluoride paste, 1,000-1,500 ppm | Cochrane-backed, half a century of trials | The default. Costs a few dollars. Mind the dose with small kids. |
| Nano-hydroxyapatite paste | Promising smaller trials, non-inferiority data vs. fluoride | The reasonable alternative, at early-adopter prices. |
| Charcoal paste | No whitening evidence; documented abrasivity concerns | No. It sands enamel, which eventually reads yellower. |
| Oil pulling | A handful of small, weak trials | Harmless as a ritual. Not a substitute for brushing anything. |
On brands, since the hydroxyapatite aisle is where the money is moving: Boka and Davids both make fluoride-free nano-hydroxyapatite pastes that are pleasant, credible, and cost several times what a drugstore tube does, a premium you're paying partly for the newer evidence file itself. Keeko, a natural oral care brand best known for coconut oil pulling sachets, sells a nice ritual, and we'd be lying if we called the oil pulling science anything but thin. Sangi's own Apagard, the 40-year original, is still sold as an import. None of these are scams. They're just priced like breakthroughs while the data is still catching up.
And charcoal: a 2017 review in the Journal of the American Dental Association found insufficient evidence for the safety and whitening claims, and the abrasion problem runs the whole logic in reverse. Scrub off enamel and the yellower dentin underneath shows through. It's a whitening product that makes teeth less white on a long enough timeline.
What the fight looks like from your sink
The strange thing about the toothpaste wars is how little the two armies actually disagree about the product. The pro-fluoride camp concedes that swallowing lots of fluoride is bad, which is why kids get a smear. The fluoride-skeptic camp mostly concedes that topical fluoride works on teeth. The entire live controversy is about water, and your toothpaste tube was never in the courtroom.
Bottom line
Fluoride toothpaste remains the default answer, and nothing in the 2024-2025 water fight changes that, because you spit toothpaste out. Hydroxyapatite is the legitimate pick for fluoride-averse adults and for very young kids who swallow paste, with the understanding that you're buying a younger evidence file at a higher price. And nobody, under any philosophy, should be whitening with charcoal.