False Statement # 6 by Steve Slott, DDS
“Relevance to water fluoridated at 0.7 ppm?”
PM: This is one of Slott’s most used misleading statements. He uses it whenever he is confronted with scientific evidence of harm.
Other popular variations of this are the following statements:
“Same with fluoride...toxic at improper levels, entirely safe at 0.7 ppm.”
“There is no valid proof of any adverse effects of water fluoridated at 0.7 ppm”
“As far as your desire for threshold of fluoride toxicity, let’s focus on water fluoridated at 0.7 ppm, okay?”
Unfortunately, all these statements are nothing but nonsense, as a fluoride water concentration does NOT mean dose.
At first it was thought that Slott was just ignorant, as he continuously confused a concentration (ppm) with dose (mg/day) -> intake. Hence he would make statements like:
“The total intake is estimated by the CDC to be in the range of 1.5 ppm to 2.8 ppm”.
"Yes, there is a risk that infants living in fluoridated areas may exceed the IOM UL of 0.7 ppm for 1-3 yo and 0.9 ppm for 4-8 yo, if tap water is used to reconstitute powdered formula."”
On many occasions the difference between dose and concentration was explained to Slott, and he was alerted to the fact that it is TOTAL intake that is of concern in any aspects of fluoride poisoning, including dental fluorosis (See also Point 2)
However, it has become apparent that Slott’s intention is to purposely mislead the reader on matters related to water fluoridation and to make him/her believe that the intake is much lower than what it actually is.
He has been alerted to the 1991 NRC/NAS scientific review which stated that TOTAL intake in “optimally fluoridated” areas is up to 6.6 mg/day. (See Point One ).
That is 9-10 times the amount contained in one liter of fluoridated water at 0.7 ppm (mg/L), and more than 6 times the amount contained in one liter fluoridated at 1 ppm (mg/L).
This fluoride comes from other sources such as food, dental products, tea, pesticides, etc..
In 1997 the EPA estimated that total fluoride intake from cryolite pesticide residues in/on food and fluoridated drinking water alone to be 0.095 mg/kg/day, meaning a person weighing 70 kg takes in more than 6.65 mg per day. (This is NOT counting additional sources such as toothpaste or other dental products, tea, or considering other fluorinated pesticides of which there are quite a few.)
see: Environmental Protection Agency, Federal Register: August 7, 1997 (Volume 62, Number 152), Notices, Page 42546-42551
In Canada, in 1977, dietary intake was already estimated to be between 3.5 and 5.5 in fluoridated areas at 1 ppm (1 mg/L):
Warrington, PD - “Ambient water quality criteria for fluoride” Resource Quality Section, Water Management Branch, Ministry of Environment, Province of British Columbia, Canada (1995)
Regardless of what “dental experts” like Steve Slott might tell the world, it is NOT “water fluoridated at 0.7 ppm” that is of concern in assessing fluoride toxicity.
TOTAL intake is.
TOTAL intake is a DOSE, while “water fluoridated at 0.7 ppm” refers to a CONCENTRATION.
A CONCENTRATION is measured in parts-per-million (ppm) or mg-per-Liter (mg/L).
A DOSE is measured in milligrams-per-day (mg/day). Often it is also stated in milligram-per-kilogram of body weight-per day (mg/kg/day)
Further, this DOSE of TOTAL intake is dependent on DURATION (how long?) and - in the case of dental fluorosis or effects on IQ - TIMING of exposure (when?).
This is established science.
“The total daily intake of fluoride is the critical quantity."
“The problem of providing optimum fluoride intake for prevention of dental caries" - Food and Nutrition Board, Division of Biology and Agriculture, National Academy of Sciences, National Research Council, Pub.#294, (1953)
"In the assessment of the safety of a water supply with respect to the fluoride concentration, the total daily fluoride intake by the individual must be considered. Apart from variations in climatic conditions, it is well known that in certain areas, fluoride containing foods form an important part of the diet. The facts should be borne in mind in deciding the concentration of fluoride to be permitted in drinking water."
World Health Organization, International Drinking Water Standards (1971)
“The total quantity of fluoride ingested is the single most important factor in determining the clinical course of skeletal fluorosis; the severity of symptoms correlates directly with the level and duration of exposure."
Review of Fluoride Benefits and Risks, Department of Health and Human Services, pg. 45 (1991)
“Accurate estimates of fluoride exposure cannot be based simply on the concentration of fluoride in drinking water. Even for older children, intake from toothpaste and mouth rinse can still equal the daily intake from food, water, and other beverages.”
Health Effects of Ingested Fluoride,/Subcommittee on Health Effects of Ingested Fluoride, Committee on Toxicology, Board on Environmental Studies and Toxicology, Commission on Life Sciences, National Research Council, pg.30 (1993)
“The daily intake of most adults is about equally divided among food, drinking water, beverages, and
Review of Fluoride: Benefits and Risks,/U.S. Department of Health & Human Services, pg.15 (1991)