On August 21, 2024, the National Toxicology Program (NTP) released the NTP Monograph on the State of the Science Concerning Fluoride Exposure and Neurodevelopment and Cognition: A Systematic Review on its official website. The report concluded, with a moderate degree of confidence, that higher estimated exposure to fluoride correlates with lower IQ levels in children. The NTP defines this higher exposure as exceeding 1.5 milligrams per liter of fluoride in drinking water, which is double the concentration typically utilized for water fluoridation. This finding raises important questions about the safety and implications of fluoride exposure, particularly concerning children’s cognitive development and overall health.
While this significant report does not specifically evaluate or apply to the practice of community water fluoridation (CWF) in the United States, there is considerable concern among health providers and public health advocates. They fear that the findings might be misinterpreted or taken out of context, potentially undermining public trust. Such misinterpretations could lead to unnecessary alarm among pregnant women and parents, prompting them to reconsider the use of fluoridated water for their families. It is crucial to communicate the context of these findings to ensure that public health remains a priority and that families feel informed.
Understanding the Turbulent Review Process: Insights from Two Drafts
For over four years, scientists, researchers, and health professionals have closely monitored the review and eventual release of this controversial report. The National Academies of Sciences, Engineering, and Medicine (NASEM) conducted thorough peer reviews of the initial two drafts submitted in 2019 and 2020, ultimately rejecting them both times. In their feedback, NASEM provided extensive and detailed lists of “deficiencies” in the work presented. They noted that the NTP had not established “clear and convincing” evidence to substantiate its previous claim that “fluoride is presumed to be a cognitive neurodevelopmental hazard to humans.” As a result, NASEM recommended “further analysis or reanalysis,” leading to the removal of the “presumed neurotoxin” label from the final report.
During the discussions that followed the second review, NASEM emphasized the necessity for the NTP to clarify that the monograph should not be used to draw any definitive conclusions regarding low fluoride exposures. This includes the levels of exposure typically associated with community water fluoridation (CWF). Such clarity is essential to prevent any miscommunication or misunderstanding about the safety of fluoride at levels commonly found in public water supplies.
Challenges Leading to Further Delays in Publication
The publication of a revised version of the report was initially scheduled for May 22, 2022, but this release was abruptly canceled due to ongoing concerns regarding the research methods employed and the conclusions drawn. Following this, an additional two years of scrutiny by an NTP Board of Scientific Advisors Working Group culminated in recommendations for an extra 93 edits and revisions. Notably, the meta-analysis component of the report was removed and is slated for publication in a separate venue. Furthermore, the NTP has eliminated its previous “hazard” designation of fluoride from the report, reflecting a significant shift in the agency’s stance.
Current Findings: Fluoride Exposure and Cognitive Outcomes
The latest version of the report asserts, with a moderate degree of confidence, that 1) exposure to fluoride at levels of 1.5 mg/L or higher is “consistently associated with lower IQ in children.” Moreover, the report stipulates that 2) “more research is needed on the effects of fluoride exposure at levels below 1.5 mg/L.” These conclusions are pivotal, as they highlight the necessity for further investigation into the effects of fluoride at lower exposure levels, which is particularly relevant for public health policies.
Interpreting the Report’s Conclusions: Expert Perspectives
The American Academy of Pediatrics (AAP) has expressed its support for ongoing research and will continue to issue guidelines regarding fluoride usage based on comprehensive expert reviews of the available evidence, in collaboration with recommendations from public health authorities. It is essential to recognize that fluoride remains a critical element in promoting optimal oral and overall health for children. This perspective underscores the AAP’s commitment to ensuring that children receive the dental care they need while considering emerging research findings.
- The NTP Monograph is a meta-analysis rather than a primary research study. It primarily examines associations without demonstrating direct causation, which is a key distinction.
- The report’s conclusions are not applicable to U.S. fluoride levels. The recommended optimal level of fluoride for U.S. water supplies is set at 0.7 mg/L, which is significantly lower than the levels considered in the report.
- Numerous confounding factors can influence IQ and its measurement, particularly in children. These factors include socioeconomic status, physical health, family dynamics, cultural background, genetics, nutrition, and environmental influences. Moreover, there are questions regarding the accuracy and comparability of IQ data obtained from various studies.
- Recent reviews contradicting the NTP’s conclusions were not factored into their analyses. Research on the relationship between fluoride exposure and neurodevelopment is diverse and has yielded inconsistent findings thus far.
- Tooth decay is the most prevalent chronic disease affecting children and adults, disproportionately impacting vulnerable populations, including children with special healthcare needs and those from low-income families and communities of color. Fluoride has demonstrated efficacy in preventing and reducing dental disease, and community water fluoridation remains an efficient and effective method for delivering primary preventative care to individuals of all ages who have access to fluoridated water systems.
Our experts concur. Dr. Charlotte W. Lewis, M.D., M.P.H., FAAP, a member of the AAP Section on Oral Health, stated, “While additional research to better understand the association and potential biological mechanisms would be important, there’s nothing about the research that makes me concerned (about) … low levels of fluoride through use of toothpaste and drinking fluoridated water.” This statement reflects the consensus among health professionals regarding the safety of fluoride at typical exposure levels.
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