Abstract

The authors conducted a systematic review on published studies to date to investigate the effect of fluoride exposure on children’s intelligence quotient (IQ) scores. PSYCHINFO, Web of Science, MEDLINE, SCI, and the China National Knowledge Infrastructure (CNKI) search engines were employed for all documents published up to 2012, in English and in Chinese. In total, 38 studies of fluoride exposure and children’s scores on IQ tests were included in this review. The weighted mean effect size (WMES) on children’s IQ scores between higher and lower regions of fluoride exposure was – .46 (CI 95% – .57 to – .35; p< .001) equivalent to 6.9 IQ points. Sensitivity analyses showed that after excluding studies that had other elements contaminations, the adverse effects of fluoride exposure on children’s intelligence remained to be significant. Further, six of the studies reported significant negative correlations between fluoride in the body and intelligence. The evidence suggests that fluoride in drinking water is a serious public health hazard.

• Related Studies :

  • The relationship of a low-iodine and high-fluoride environment to subclinical cretinism in Xinjiang.

    Cretinism in iodine-deficiency areas is well known, yet the milder forms of somatic and psychomotor maldevelopment and thyroid dysfunction caused by iodine deficiency may be more difficult to detect. DeQuervain, in 1936, called this milder form "semi-cretinism," while in 1980 Laggasse used the term "cretinoidism." It was formally named "subclinical

  • Assessment of intelligence quotient among schoolchildren of fishermen community of Kutch, Gujarat, India

    Background and aim: The aim of the study was to assess the intelligence quotient of fishermen schoolchildren of Kutch, Gujarat, India. Materials and methods: A descriptive cross-sectional study was conducted among 8 to 10 years old schoolchildren living in Kutch District, Gujarat, India, from January to February 2013. Seguin Form Board

  • The relationships between low levels of urine fluoride on children’s intelligence, dental fluorosis in endemic fluorosis areas in Hulunbuir, Inner Mongolia, China.

    There has been public concern about children's intellectual performance at high levels of fluoride exposure, but few studies provide data directly to the question of whether low fluoride exposure levels less than 3.0 mg/L in drinking water adversely associated with children's intelligence. In this survey, we investigated the effects of

  • Effect of fluoride exposure on intelligence in children.

    The intelligence was measured of 907 children aged 8-13 years living in areas which differed in the amount of fluoride present in the environment. The Intelligence Quotient (IQ) of children living in areas with a medium or severe prevalence of fluorosis was lower than that of children living in areas

  • Investigation and Analysis of Children’s IQ and Dental Fluorosis in a High Fluoride Area

    Objective: To understand the relationship of dental fluorosis and IQ among children in a high fluoride area and further study the harm of high fluoride to the human body. Method: High fluoride areas (from drinking water) in Qi County were selected as the site of investigation. The subjects of the study

• Related FAN Content :

  • Fluoride Affects Learning & Memory in Animals

    An association between elevated fluoride exposure and reduced intelligence has now been observed in 64 IQ studies. Although a link between fluoride and intelligence might initially seem surprising or random, it is actually consistent with a large body of animal research. This animal research includes the following 45 studies (out

  • Fluoride & IQ: The 64 Studies

    As of December 2019, a total of 72 studies have investigated the relationship between fluoride and human intelligence. Of these investigations, 64 studies have found that elevated fluoride exposure is associated with reduced IQ in humans, while over 60 animal studies have found that fluoride exposure impairs the learning and/or

  • Fluoride's Direct Effects on Brain: Animal Studies

    The possibility that fluoride ingestion may impair intelligence and other indices of neurological function is supported by a vast body of animal research, including over 40 studies that have investigated fluoride's effects on brain quality in animals. As discussed by the National Research Council, the studies have consistently demonstrated that fluoride, at widely varying concentrations, is toxic to the brain.

  • Fluoride: Developmental Neurotoxicity

    Developmental Neurotoxicity There has been a tremendous amount of research done on the association of exposure to fluoride with developmental neurotoxicity. There are over 60 studies reporting reduced IQ in children and several on the impaired learning/memory in animals. And there are studies which link fluoride to Attention Deficit Hyperactivity Disorder. Critical

  • NRC (2006): Fluoride's Neurotoxicity and Neurobehavioral Effects

    The NRC's analysis on fluoride and the brain.