There have been many studies on water fluoridation and its effects. The evidence strongly suggests that water fluoridation is not safe or effective.
Over 400 studies have now shown fluoride to be damaging to the brain and 61 studies have shown fluoride to reduce IQ in humans (FAN, 2019).
Here are a few of the most relevant and significant studies:
Prenatal Fluoride Exposure and Cognitive Outcomes in Children at 4 and 6-12 Years of Age in Mexico (Bashash, M. et al. 2017) – https://www.ncbi.nlm.nih.gov/pubmed/28937959
A Complete Waste of Money! Water Fluoridation Costs for England, 2013-2021 (Warren, J. A. and Pain, G. 2017) – https://www.researchgate.net/publication/319460176_A_Complete_Waste_of_Money_Water_Fluoridation_Costs_for_England_2013-2021
Are fluoride levels in drinking water associated with hypothyroidism prevalence in England? A large observational study of GP practice data and fluoride levels in drinking water (Peckham, S., Lowery, D. and Spencer, S. 2015) – http://jech.bmj.com/content/69/7/619
Water Fluoridation: A Critical Review of the Physiological Effects of Ingested Fluoride as a Public Health Intervention (Peckham, S. and Awofeso, N. 2014) – https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3956646/
Developmental Fluoride Neurotoxicity: A Systematic Review and Meta-Analysis (A. L. Choi, et al. 2012) – https://ehp.niehs.nih.gov/1104912/
Systematic Review of Water Fluoridation (McDonagh, et al. 2010) – http://www.bmj.com/content/321/7265/855
The above review by McDonagh, et al. has been often misrepresented and used to promote fluoridation. Please also read this letter from Professor Trevor Sheldon, the chair of the advisory group for this review: https://www.nofluoride.com/york_report_chairman.cfm
Fluoride Action Network (2019) Brain [Online] Available at: https://fluoridealert.org/issues/health/brain/ (Accessed on 4th October 2019)
Fluoride Action Network (2019) Fluoride & IQ: The 61 studies (2019) [Online] Available at: http://fluoridealert.org/studies/brain01/?fbclid=IwAR0kh0GDOScVjThCxUCYKzBOBVVrfkFzuJRwGg85SjphXgMeb2I7WEo_YVo (Accessed on 4th October 2019)