Outdated? Fluoride in drinking water

Publications & Resources

FLUORIDE PRESENTATIONS

September 28, 2023: Dr Damian Wojcik presented to the Whangarei District Council. Video with references available here.

October 27, 2023: Jodie Bruning (MA Sociology) presented to the Bay of Plenty Regional Council (28 mins). Video with PowerPoint slides available here (0-28 mins). Transcript available here.

November 6, 2023: Jodie Bruning (MA Sociology) presented to the Tauranga City Commissioners and management. YouTube video (5.30-13.00). Warning: poor sound quality. Link: Reference paper (PDF) handed to staff and commissioners and tabled by TCC.

The text presented to Tauranga City Commissioners was re-presented with references in a YouTube video (14 minutes). This has been sent in an email to elected members in all councils affected by the Director-General's order to fluoridate water.

Following the Tauranga presentation Jodie Bruning agreed to an interview on Reality Check Radio to discuss the topic presented to Tauranga City Commissioners: Uncertainty about pending challenges to the lawfulness of Ministry of Health fluoride directives to TLAs.

PSGR welcomes interviews from all media in New Zealand on the topics we cover.

INTERVIEW

Professor Philippe Grandjean is a professor of environmental medicine at the University of Southern Denmark and a research professor at the University of Rhode Island. Jodie Bruning interviewed Professor Grandjean October, 2023.

‘We have to do everything we can to remove toxic exposures to support brain development.’

LISTEN TO: FULL INTERVIEW OR SHORT EXCERPT.

This study lead by Grandjean brought together 3 cohort studies, from Mexico (ELEMENT study), Canada (MIREC) and Denmark (OCC) of mothers and infants. With over 1500 mother child pairs participating, this study was highly powered. The dose levels overlapped.

• Maternal urine-fluoride concentrations were measured, and child IQ was determined at age 7 years

• Higher-level fluoride exposures in North America and lower-level exposures in Denmark gave the researchers a broad basis to arrive at a joint benchmark dose level, where at that level one IQ point would be lost. This was 0.45 mg/l fluoride in urine. • Regulators need to know the lowest level at which harm (a lowered IQ as a result of exposure) might commence, the approximate threshold for fluoride neurotoxicity, benchmark dose confidence level. In this study it was found to be at 0.33 mg/l fluoride in urine.

• The WHO's guideline value in drinking water is 1.5 mg/l (1500 µg/l). This was set in 1984.

• Background levels are found low level in nature. Fluoride is not a nutrient, rather it is a toxicant. Humans might have evolved a degree of tolerance at lower levels.

• This study contributes to 20 years of research into developmental neurotoxicity and fluoride.

• Developmental exposures which alter intelligence impact the capacity of that child to progress in life.

• The 'optimal level' for addition to drinking water has been in place since the 1950's 'In areas with a hot climate, the "optimal" fluoride concentration is below 1 mg/litre while in cold climates it may be up to 1.2 mg/litre (Galagan & Vermillion, 1957). See 1984 WHO EHC 36: https://iris.who.int/bitstream/handle/10665/37288/9241540966-eng.pdf?sequence=1

• Philippe Grandjean and Jodie Bruning discussed a 40-year history of stacking scientific committees considering fluoride and health, with oral and dental experts. Oral and dental experts may be more likely to support fluoridation of water, and thus have a bias, or weight their decision-making to support fluoridation.

FOR MORE INFORMATION: Grandjean P, Meddis A, Nielsen F, Beck IH, Bilenberg N, Goodman CV, Hu H, Till C, Budtz-Jørgensen E. (2023) Dose dependence of prenatal fluoride exposure associations with cognitive performance at school age in three prospective studies. Eur J Public Health. 2023 Oct 5:ckad170. doi: 10.1093/eurpub/ckad170. Epub ahead of print. PMID: 37798092

University of Southern Denmark press release: https://www.sdu.dk/en/om_sdu/fakulteterne/sundhedsvidenskab/nyheder/fluor-paavirker-intelligensen (in English)

PDF copy of the references cited at the end of the interview.

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