Fluoride vs Fluoride-Free Toothpaste — What the Research Says

Fluoride in toothpaste — where it came from and how it works

Sodium Fluoride and Sodium Monofluorophosphate are active ingredients found in the vast majority of toothpastes since the 1950s. Their action rests on three mechanisms:

1. Remineralisation: Fluoride ions bind with calcium and phosphate ions in enamel to form fluorapatite — a form of hydroxyapatite that is more resistant to the acids produced by plaque bacteria.
2. Bacterial inhibition: At the concentrations used in toothpastes, fluoride inhibits the enzymatic activity of Streptococcus mutans — the main cavity-causing pathogen.
3. Reduced demineralisation: The presence of fluoride ions in the mouth lowers the pH threshold at which enamel begins to dissolve.

A 2019 Cochrane review (Walsh et al.) covering 96 randomised trials confirms that fluoride toothpastes at concentrations of 1,000–1,500 ppm reduce the risk of tooth decay in both children and adults compared with placebo.

How much fluoride in toothpaste is safe?

EU Regulation 1223/2009 (Annex III) permits fluoride in toothpaste at a maximum concentration of 0.15% (1,500 ppm F). Toothpastes for children under 6 typically contain 500–1,000 ppm, while adult toothpastes contain 1,000–1,500 ppm. Higher-concentration pastes (1,450–5,000 ppm) are prescription products used in patients at high risk of decay.

Compare toothpastes and their formulations in the toothpaste category on PurScore.pl.

Fluorosis — when is it a risk?

Fluorosis is a disorder of enamel mineralisation caused by excessive exposure to fluoride while the permanent teeth are forming (up to around age 8). It shows up as white spots or, in more severe forms, brown discolouration and pitting of the enamel. The risk of fluorosis increases with:

• young children swallowing toothpaste (hence the recommendation of a pea-sized amount for children aged 3–6),
• using high-fluoride toothpastes in infants and young children,
• living in areas where the water naturally contains high levels of fluoride (above 1.5 mg/l).

For adults with permanent teeth, fluorosis is no longer possible — the risk applies only during the mineralisation of the permanent teeth.

Fluoride-free toothpaste — the arguments and the reality

Makers of fluoride-free toothpaste offer a range of alternatives:

• Hydroxyapatite (nano-HA): A synthetic form of the mineral that naturally builds enamel. Studies (including Tschoppe et al., 2011; Enax et al., 2019) suggest that nano-HA may offer remineralising effectiveness comparable to low concentrations of fluoride. The European Food Safety Authority (EFSA) and the SCCS assess nano-HA as safe at the concentrations used in toothpastes (up to 10%).
• Xylitol: Inhibits the growth of S. mutans and reduces the stickiness of saliva. It is usually used as a supporting ingredient rather than a standalone fluoride alternative.
• Calcium carbonate, zeolites: Abrasives — they polish the enamel but do not provide remineralisation comparable to fluoride.

An honest summary: for most adults with a normal diet and access to dental care, hydroxyapatite toothpastes may be sufficient. However, for children at risk of decay and adults with dry mouth, orthodontic appliances or periodontal disease, fluoride at the recommended concentrations remains the gold standard.

What do the scientific organisations say?

The Polish Dental Society, the European Association of Paediatric Dentistry (EAPD) and the WHO recommend fluoride toothpaste as the foundation of cavity prevention for all age groups (with the concentration adjusted accordingly). No major scientific organisation recommends routinely replacing fluoride with other ingredients in people without specific medical indications.

Who might consider a fluoride-free toothpaste?

• People living in regions with naturally high fluoride levels in drinking water (>1.5 mg/l) — after consulting a dentist.
• Parents who prefer hydroxyapatite for children who swallow toothpaste (until they learn to spit it out) — as an option, not the rule.
• People with a confirmed hypersensitivity to fluorides (rare).

You can find a complete database of toothpaste ingredients and their safety profiles in the PurScore Ingredient Encyclopedia. Compare teeth-whitening products in the teeth whitening category.

This article is educational and does not replace advice from a dentist. The choice of toothpaste — especially for children — is best discussed with a dental professional.

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