Fluoride in 2026: New Studies and the EPA Review, Explained

Community water fluoridation has been argued about for eighty years, but 2026 is the first year in a while that the argument moved on both fronts at once: new peer-reviewed evidence on safety, and a federal regulator reopening the question of risk. This piece lays out what actually happened, what the numbers say, and what it means if you live and drink tap water in Miami-Dade, Broward or Palm Beach.

The baseline: what fluoridation does

The U.S. Public Health Service recommends 0.7 parts per million of fluoride in community water. At that level, the American Dental Association (ADA) and the CDC put the benefit plainly: fluoridation prevents at least 25 percent of tooth decay in children and adults across their lifetime, regardless of age, income or access to a dentist [1][3]. The CDC counts it among the ten great public health achievements of the twentieth century [3]. None of that is new. What is new is the quality of the safety evidence and the political weather around it.

April 2026: three papers, one direction

In the space of two weeks in April 2026, three independent pieces of work were published, and the ADA summarised them on April 17 [1]:

• A cohort study in the Proceedings of the National Academy of Sciences (April 13, 2026) followed 10,317 participants of the Wisconsin Longitudinal Study and found no evidence that community water fluoridation reduced adolescent IQ or adult cognitive function, tracked through age 80 [1].
• A narrative review in The Journal of the American Dental Association (April 6, 2026) found no association between fluoride from community water fluoridation and children’s IQ scores [1].
• A systematic review in JDR Clinical and Translational Research covering 74 studies found that fluoridated communities experienced fewer cavities [1].

The ADA president, Dr. Richard Rosato, called the evidence “clear” that fluoridation at recommended levels is not linked to lower IQ or reduced cognitive outcomes [1]. The distinction that matters in every one of these papers is the dose: the IQ concerns that circulate online come from studies of naturally high fluoride exposure, typically well above 1.5 mg/L, not from the 0.7 ppm used in American systems.

February 2026: the EPA opens an accelerated review

On February 6, 2026, the Environmental Protection Agency initiated an accelerated review of fluoride in drinking water under the Safe Drinking Water Act, following a 2024 federal court ruling that directed the agency to strengthen its evaluation of potential health risks, with a stated focus on brain and tooth development [2]. The EPA published a preliminary assessment plan, with a 30-day comment period and external peer review to follow [2].

The ADA’s response was procedural rather than defensive. It asked for “an objective, evidence-based process utilizing all the latest peer-reviewed, valid and reproducible research,” and objected that the EPA’s plan appeared to exclude recently published studies that found no negative association between optimally fluoridated water and cognition [2]. In plain terms: the dental profession is not asking the EPA to skip the review; it is asking the EPA to include the April papers in it.

What this means in South Florida

Miami-Dade, Broward and Palm Beach county utilities fluoridate at or near the 0.7 ppm target, so the April findings describe exactly the exposure a local family gets from the tap. For patients, the practical guidance from the desk is unchanged:

1. Tap water at 0.7 ppm is the baseline protection; bottled water usually carries none, which matters for children who drink only bottled.
2. Fluoride toothpaste twice a day is still the single most effective home measure, and it is independent of the water question.
3. Professional fluoride varnish is worth asking about for children and for adults with dry mouth, exposed roots or a history of decay.

If the EPA review changes the federal recommendation, this publication will say so the day it happens. Until then, the evidence base got stronger in 2026, not weaker.

Sources

1. American Dental Association, ADA News, April 17, 2026 — New research reaffirms recommended fluoride levels do not negatively affect IQ.
2. American Dental Association, ADA News, February 6, 2026 — EPA initiates accelerated review of fluoride in drinking water.
3. American Dental Association, press release, September 25, 2024 — Community water fluoridation at optimal levels is safe and effective.