Since the mid-20th century, the addition of fluoride to public drinking water in the United States has been hailed as a monumental public health measure, dramatically reducing the incidence of dental caries among children. Fluoride’s unique ability to fortify tooth enamel by replacing weaker ions has served as a protective barrier against decay-inducing bacteria. However, a recent modeling study led by researchers at Mass General Brigham has employed advanced microsimulation techniques to project the consequences of a hypothetical nationwide ban on water fluoridation, revealing alarming increases in tooth decay and substantial economic repercussions.

Drawing from a rich dataset of over 8,000 children aged 0 to 19, derived from the National Health and Nutrition Examination Survey (NHANES), the study employed a microsimulation model to predict the trajectory of dental health outcomes over five- and ten-year horizons under two distinct scenarios: continuation of fluoride addition versus complete cessation. This modeling approach, notable for its capacity to account for variability through repeated simulations, provides a robust framework for anticipating the public health impact of policy changes before real-world implementation.

The findings are stark and sobering. Within just five years of a fluoride ban, the model estimates a 7.5 percentage point increase in the prevalence of dental decay among children. Translated into absolute numbers, this amounts to an additional 25.4 million decayed teeth, effectively meaning that one in every three American children could suffer from new or worsening tooth decay. This outcome not only would represent a public health setback but also signals an impending rise in demand for dental treatments that could strain healthcare systems.

The economic dimension of the study underscores the gravity of these health outcomes. The increase in dental decay is projected to incur an additional $9.8 billion in dental care costs within five years, escalating to nearly $19.4 billion over a decade. Importantly, a significant proportion of these costs would fall upon publicly insured children, thereby translating into a direct fiscal burden for government healthcare programs. Such projections highlight the intersection between preventive health measures and economic sustainability in health policy.

Fluorosis, a mild discoloration of tooth enamel linked to excessive fluoride exposure, showed a minor decline by 0.2 million cases in the no-fluoride scenario, reflecting a small trade-off in reducing this adverse effect. However, the overwhelmingly negative consequences in tooth decay prevalence and associated costs overshadow any potential benefits of reduced fluorosis occurrence.

Central to the protective efficacy of fluoride is its role in replacing hydroxyl ions within hydroxyapatite crystals in the enamel with fluoride ions, forming fluorapatite—a compound more resistant to acid dissolution from bacterial metabolism. This biochemical mechanism underpins the long-recognized cariostatic effects of fluoride. The study highlights how this seemingly small ionic substitution at the molecular level has profound population-level health impacts.

The research team, led by dental epidemiologist Sung Eun Choi and senior author Dr. Lisa Simon of Brigham and Women’s Hospital, underscore the robustness of their simulations. By running the model 1,000 times with varying assumptions and parameters, they ensured that the outcomes reflect plausible real-world scenarios, accounting for heterogeneity in exposure, susceptibility, and healthcare utilization. This methodological rigor enhances confidence in the validity of their projections.

Notably, the study concentrates on the pediatric population, given that tooth development during childhood is particularly sensitive to fluoride’s protective influence. Teeth formed during fluoride exposure tend to be more resilient to decay across the lifespan. Consequently, disruption of fluoridation could have enduring effects beyond the immediate timeframes simulated, potentially magnifying oral health disparities.

While concerns have occasionally been raised about fluoride’s effects on neurodevelopment, the researchers explicitly note that their model does not include cognitive outcomes due to the current scientific consensus that fluoride levels maintained in public water supplies are not associated with adverse neurobehavioral effects. This focus sharpens the analysis on well-characterized oral health metrics, bolstering its relevance for public health policy deliberations.

The implications of this study reverberate through debates about water fluoridation policies. Fluoride at the EPA-recommended safe levels provides a cost-effective, equitable preventive measure widely accessible across communities. Removal of such a measure risks exacerbating oral health inequalities, particularly for low-income or uninsured children who rely more heavily on community water fluoridation for cavity prevention.

Furthermore, the findings resonate with empirical observations from regions like Calgary, Canada, where fluoridation cessation has been linked with notable increases in dental decay. This modeling effort complements and extends such empirical data by quantifying the national scale impact in the United States, providing a powerful tool for policymakers and public health advocates.

In sum, this comprehensive analysis elucidates the critical importance of water fluoridation as a cornerstone of preventive dentistry. Its removal would likely precipitate a dramatic surge in dental caries and associated costs, burdening families, healthcare systems, and public coffers alike. The study serves as a clarion call to preserve this long-standing public health intervention amid ongoing discussions about its future.

Subject of Research: Impact of removing fluoride from public drinking water on children’s dental health and associated costs

Article Title: Modeling Study Predicts National Fluoride Ban Would Substantially Increase Children’s Tooth Decay and Dental Costs

News Publication Date: 30-May-2025

Web References:

• Mass General Brigham: https://www.massgeneralbrigham.org/
• National Health and Nutrition Examination Survey (NHANES): https://www.cdc.gov/nchs/nhanes/index.html
• JAMA Health Forum article: https://jamanetwork.com/journals/jama-health-forum/fullarticle/10.1001/jamahealthforum.2025.1166?utm_source=For_The_Media&utm_medium=referral&utm_campaign=ftm_links&utm_term=053025
• Fluoride neurobehavioral outcomes report: https://ntp.niehs.nih.gov/sites/default/files/2024-08/fluoride_final_508.pdf

References:
Choi SE, Simon L, “Projected Impact of Removing Fluoride from Public Water Systems in the United States,” JAMA Health Forum, DOI: 10.1001/jamahealthforum.2025.1166

Keywords: Health and medicine, fluoride, dental decay, dental health, public health policy, microsimulation modeling, pediatric oral health, dental economics