Margin of Safety and the Updated NTP Review
By Paul Connett, PhD
Director, Fluoride Action Network
Introduction. When
fluoride levels in the public drinking water supply are artificially
increased, usually by around 350% using fluoridation chemicals such as
fluorosilicic acid, our utility employees and politicians take on
the role of a physician or dentist. Their intent is not to treat the
water, but to treat the water consumer as a patient being prescribed a drug for the ostensible purpose of reducing dental decay.
In
a clinical setting, practitioners prescribing a drug or treatment to
patients work to successfully treat
However, unlike a clinical setting, water fluoridation is a treatment administered to an entire community rather than an individual, and there is no control over intake (dose) since people vary greatly in their water consumption and overall exposure to fluoride from all sources.
Everyone
is exposed, many for their entire lives, regardless of age, weight,
diet, genetics, medical history, total fluoride exposure, or even caries
risk. No consent is given, and by the design of those promoting
fluoridation, very few consumers have been informed of potential side
effects or risks associated with overexposure. There is also no
follow-up by the “practitioner” in this case or monitoring for
adverse-reactions.
This chaotic and unregulated dispensing of fluoride makes the importance
of applying a regulatory margin of safety to fluoridation critical in
an effort to protect whole populations, including the most vulnerable.
An adequate margin of safety has to take into account the wide range of
individual sensitivity expected in a large population and the wide range
of doses to which people are exposed.
Hundreds of published
peer-reviewed animal and human studies now link fluoride exposure to
significant side effects. According to chapter 20 of “The Case Against Fluoride:
“It is not disputed that, at moderate to high doses, fluoride can cause serious health problems and other adverse effects. The crucial question is whether there is a sufficient margin of safety between the doses that cause those effects and the doses experienced in fluoridated communities…this margin of safety has to be sufficiently large to protect everyone, including the most vulnerable, not just the average person. Moreover, it has to be large enough to protect the whole population over a lifetime of exposure.”
Taking
just these higher-fluoride-dose studies into account, if the EPA
applied the normal toxicological procedures and appropriate margins of
safety to fluoridation, the practice would be prohibited. This is
because in toxicology a standard safety factor of 10 is generally used
to extrapolate from the result of a small study group (say of 100 -200
individuals) to find a dose which is protective of everyone in a large
population (say several million). This is called the “intra species
safety factor.” In protecting public health, you have to be
conservative. In short, regulators have to assume that there are
individuals in the large population who are ten times more sensitive to
the toxic chemical in question, than anyone in the small study group.
Fluoride and Neurotoxicity
Turning now to the current situation with fluoride and neurotoxicity, key studies published since 2017, indicate that affects are being observed at the current fluoride exposure levels experienced in fluoridated communities (Bashash 2017, 2018; Green 2019; Riddell 2019; and Till 2020). Adding to the significance here is the fact that nearly all of these studies have been funded by the NIH and as such their methodologies have been extremely rigorous, so there is little wriggle room for doubt on the matter.
This subset of the data
(involving exposure to the fetus and the bottle fed infant) is damning
as far as the practice of water fluoridation is concerned and that is
why we are seeing such desperate efforts by the die-hard fluoridation
promoters, who are doing everything to discredit these studies. These
efforts include hounding one of the key authors (Professor Christine
Till). But even if we go beyond this subset and examine the totality of
all the neurotoxicity studies, there is no salvation for this outdated
practice.
The NTP Review
The updated draft of the NTP (National Toxicology Program) systematic review confirms that fluoride is a presumed developmental neurotoxicant. While claiming that the evidence is stronger and more consistent for studies in which subjects were consuming water at or above 1.5 ppm, this conclusion by itself should end fluoridation as a public health policy. These are the documents released by the NTP:
- September 16, 2020. Draft NTP Monograph on the Systematic Review of Fluoride Exposure and Neurodevelopmental and Cognitive Health Effects.
- September 16, 2020. Protocol for the Systematic Review of Fluoride Exposure and Neurodevelopmental and Cognitive Health Effects. Project Leader: Kyla Taylor, PhD.
- September 16, 2020. Literature Search Results for the Systematic Review of Fluoride Exposure and Neurodevelopmental and Cognitive Health Effects.
Clearly,
returning to the subject of this bulletin, there is no adequate margin
of safety when exposing millions of fetuses, infants and children to
concentrations of fluoride in water at 1.5 ppm. This is just a factor of TWO
times larger than levels that are typically used in fluoridation
programs (0.7ppm) and does not come close to providing the necessary and
standard safety factor of TEN.
In conclusion, as
confirmed by the National Toxicology Program (the premier toxicological
body in the US), the scientific literature is clear and consistent in
showing that harm occurs to the developing brain occurs at or above 1.5
ppm, and thus there is no adequate margin of safety currently
between the fluoride levels residents in fluoridated communities are
being exposed to and those that are causing harm in NIH-funded studies.
Water fluoridation needs to be discontinued immediately.
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