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Johnson False Statement #2:

"Below 4mg/L (4ppm) of naturally occurring fluoride in water, health problems do not exist."

More complete nonsense by “dental expert” Johnson.

There are literally hundreds, if not thousands, of studies from all around the world showing adverse health effects at water fluoride concentrations of less than 4 ppm. (Many of these studies can also be found in the 2006 NRC review.)

A short list is provided below, with studies from India, China, Mexico, Russia, Turkey, Italy, Iran, Morocco, etc..

Alarcón-Herrera MT, Martín-Domínguez IR, Trejo-Vázquez R, Rodriguez-Dozal S - "Well water fluoride, dental fluorosis and bone fractures in the Guadiana Valley of Mexico" Fluoride 34:139-149 (2001)

Arvind BA, Isaac A, Murthy NS, Somanna SN et al - "Prevalence and severity of dental fluorosis and genu valgum among school children in a rural field practice area of a medical college" Asian Pac J Trop Dis 2(6): 465-469 (2012)

Ayoob S, Gupta A - "Fluoride in Drinking Water: A Review on the Status and Stress Effects" Critical Reviews in Environmental Science and Technology 36:433-487 (2006)

Bachinskii PP, Gutsalenko OA, Naryzhniuk ND, Sidora VD, Shliakhta AI - "Action of the body fluorine of healthy persons and thyroidopathy patients on the function of hypophyseal-thyroid the system" Probl Endokrinol (Mosk) 31(6):25-9 (1985)  

Dai GJ, Zhang ZY, Qian C, Zhai C, Gao HD - "Distributive regulation of bone substance change in various population sub-groups with different fluoride concentrations in drinking water" Chinese Journal of Endemiology 02 (2004)

Dai G, Gao HX, Zhang GH, Chen C, Liu DF, Qian C, Li J, Zhang XD, Huo QC, Yi G, Hua Z, Xu J, Liu ST - "Quantitative epidemiological research on the relationship between fluoride concentration of drinking water and endemic fluoride poisoning" Chinese Journal of Endemiology 7(1):21-26 (1988)  

Ding Y, Yanhui Gao, Sun H, Han H, Wang W, Ji X, Liu X, Sun D - "The relationships between low levels of urine fluoride on children's intelligence, dental fluorosis in endemic fluorosis areas in Hulunbuir, Inner Mongolia, China" J Hazard Mate 186(2-3):1942-6 (2011)

Gupta R, Kumar AN, Bandhu S, Gupta S - "Skeletal fluorosis mimicking seronegative arthritis" Scandanavian Journal of Rheumatology 36(2):154-5 (2007)  

Heikens A, Sumarti S, van Bergen M, Widianarko B, Fokkert L, van Leeuwen K, Seinen W - "The impact of the hyperacid Ijen Crater Lake: risks of excess fluoride to human health" Sci Total Environ 15;346(1-3):56-69 (2005) 

Isaac A, Delphine W, Silvia CR, Somanna SN, Mysorekar V, Narayana K, et al. - "Prevalence and manifestations of water-born fluorosis among school children in Kaiwara village of India: a preliminary study" Asian Biomed 3:1-4 (2009)  

Jooste PL, Weight MJ, Kriek JA, Louw AJ - “Endemic goitre in the absence of iodine deficiency in schoolchildren of the Northern Cape Province of South Africa” Eur J Clin Nutr 53(1):8-12 (1999)

Lin Fa-Fu, et al - "The relationship of a low-iodine and high-fluoride environment to subclinical cretinism in Xinjiang" Endemic Disease Bulletin 6(2):62-67 (1991) [also in: Iodine Deficiency Disorder Newsletter Vol. 7 (3) :24-25 (1991)]  (High F = 0.88 ppm - Low F = 0.34 ppm)

Liu et al, - "The detection of children's T3,T4 and TSH levels in an endemic fluorosis area" End Dis Bull 14
(1):16-17 (1999)

Lombarte M, Fina BL, Lupo M, Buzalaf MA, Rigalli A - "Physical exercise ameliorates the toxic effect of fluoride on the insulin glucose system" J Endocrinol 218(1):99-103 (2013)  

Misra UK, Nag D, Husain M, Newton G, Ray PK - "Endemic fluorosis presenting as cervical cord compression" Archives of Environmental Health 43:18-21 (1988)

Poureslami HR, et al.- "Intelligence quotient of 7 to 9 year-old children from an area with high fluoride in drinking water" Journal of Dentistry and Oral Hygiene 3(4):61-64 (2011)

Qin LS, Cui SY - "Using the Raven’s standard progressive matrices to determine the effects of the level of fluoride in drinking water on the intellectual ability of school-age children" Chinese Journal of the Control of Endemic Diseases 5(4):203-04 (1990) [also in Fluoride 41:115–19 (2008)]

Ren D, et al. - "A study of the intellectual ability of 8-14 year-old children in high fluoride, low iodine areas" Chinese Journal of Control of Endemic Diseases 4(4):251 (1989) [also in Fluoride 41:319-20 (2008)]. 

Ruiz-Payan A, Duarte-Gardea M, Ortiz M, Hurtado R - "Chronic effects of fluoride on growth, blood chemistry, and thyroid hormones in adolescents residing in three communities in Northern Mexico" Abstracts, XXVIth ISFR Conference, Wiesbaden, Germany, September 26-29, 2005 SEE ALSO: Alma Ruiz-Payan, "Chronic effects of fluoride on growth, blood chemistry and thyroid hormones in adolescents residing in three communities in Northern Mexico" (January 1, 2006). ETD Collection for University of Texas, El Paso. Paper AAI3214004.

Saxena S, Sahay A, Goel P - "Effect of fluoride exposure on the intelligence of  school children in Madhya Pradesh, India"  J Neurosci Rural Pract. 3(2):144-9 (2012)

Seraj B, et al.- "Effect of high water fluoride concentration on the intellectual development of children in Makoo/Iran" Journal of Dentistry, Tehran University of Medical Sciences  9(3): 221-29 (2012)

Shivaprakash PK, et al. - "Relation between dental fluorosis and intelligence quotient in school children of Bagalkot district" J Indian Soc Pedod Prev Dent. 29(2):117-20 (2011)

Tamer MN, Kale Köroğlu B, Arslan C, Akdoğan M, Köroğlu M, Cam H, Yildiz M - "Osteosclerosis due to endemic fluorosis" Sci Total Environ 373(1):43-8 (2007)

Trivedi MH, et al. - "Assessment of groundwater quality with special reference to fluoride and its impact on IQ of schoolchildren in six villages of the Mundra Region, Kachchh, Gujurat, India" Fluoride 45(4):377-83 (2012)

Yao Y, et al. - "Comparative assessment of the physical and mental development of children in endemic fluorosis area with water improvement and without water improvement" Literature and Information on Preventive Medicine 3(1):42-43 (1997)