Abstract
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 were 7-to-10-year-old children. Dental fluorosis was diagnosed using the Dean Index, and IQ was determined with the Chinese combined Raven’s test.
Results: The average IQ among the children in the high fluoride area was 98.06 and the rate of mental retardation was 5.47%. Intelligence distribution in the children with and without dental fluorosis did not show any difference, and no sex-specific differences in intelligence were found.
Conclusions: The long-term consumption of high fluoride water may adversely affect children’s intelligence.
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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
Children, aged 9–10½, from 22 villages in Jing County, Hubei Province, China, with different levels of fluoride in the drinking water were tested for their IQs according to the revised version of Raven’s Standard Progressive Matrices. Among 141 children in villages with 2.1–4.0 ppm F in the drinking water, 34
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Letter to the Editor: IQ of 9-12 year-old children in high and low-drinking water fluoride areas in West Axerbaijan Province, Iran: Further information on the two villages in the study and the confounding factors considered.
In a critique of our study1 on the IQ of 9–12-year-old children in high- and low drinking water fluoride (F) areas in West Azerbaijan province, Iran, Dr Ken Perrott questioned whether possible confounding factors in the two villages, such as the rural status and parental educational levels, were adequately considered.2 Perrott’s
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Influence of fluoride exposure on reaction time and visuospatial organization in children
Fluoride exposure is an important public health problem in several Mexican states. In the city of San Luis Potosi, Mexico, above 90% of the children have some degree of dental fluorosis. The main source of exposure to fluoride is tap water. The objective of the study was to evaluate the
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Fluoride and its effect on human intelligence: a systematic review.
Objectives: A systematic review was undertaken to examine if fluoride (F-) exposure is associated with a decline in human intelligence (IQ). Materials and Methods: Ovid MEDLINE and its allied versions, CINAHL, AMED, EMBASE, Cochrane DSR, ACP Journal Club, DARE, CCTR, CMR, HTA, and NHSEED, Health and Psychosocial Instruments, HealthSTAR, International
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Relationship between dental fluorosis and intelligence quotient of school going children in and around Lucknow district: a cross-sectional study
Background: Fluoridation of drinking water, despite being regarded as one of the top ten public health achievements of the twentieth century, has remained a much debated concept. Various studies on animals and aborted human fetuses have confirmed that excessive fluoride intake during infancy and early childhood, causes a number of
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Fluoride & IQ: 74 Studies
As of January 2022, a total of 83 studies have investigated the relationship between fluoride and human intelligence. Of these investigations, 74 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
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Fluoride Affects Learning & Memory in Animals
An association between elevated fluoride exposure and reduced intelligence has now been observed in 65 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
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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.
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Fluoride's Effect on Fetal Brain
The human placenta does not prevent the passage of fluoride from a pregnant mother's bloodstream to the fetus. As a result, a fetus can be harmed by fluoride ingested pregnancy. Based on research from China, the fetal brain is one of the organs susceptible to fluoride poisoning. As highlighted by the excerpts
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NRC (2006): Fluoride's Neurotoxicity and Neurobehavioral Effects
The NRC's analysis on fluoride and the brain.
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