Our findings show that children with elevated prenatal exposure to fluoride were more likely to show symptoms of ADHD as reported by parents. Prenatal fluoride exposure was more strongly associated with inattentive behaviours and cognitive problems, but not with hyperactivity, said Bashash.
There is overwhelming evidence that the prolonged ingestion of fluoride causes significant damage to health and particularly to the nervous system. According to University of Toronto and York University researchers, higher levels of fluoride during pregnancy have now been linked with more ADHD-like symptoms in school-age children.
Fluoride can be toxic by ingesting one part per million (ppm), and the effects are not immediate, as they can take 20 years or more to become evident.
Our findings are consistent with a growing body of evidence suggesting that the growing fetal nervous system may be negatively affected by higher levels of fluoride exposure, said Dr. Morteza Bashash, the studys lead author and researcher at the Dalla Lana School of Public Health.
The study, Prenatal Fluoride Exposure and Attention Deficit Hyperactivity Disorder (ADHD) Symptoms in Children at 6-12 Years of Age in Mexico City, published in Environment International, analyzed data from 213 mother-child pairs in Mexico City that were part of the Early Life Exposures in Mexico to Environmental Toxicants (ELEMENT) project, which recruited pregnant women from 1994 to 2005 and has continued to follow the women and their children ever since.
Tap water and dental products have been fluoridated in communities in Canada and the United States (as well as milk and table salt in some other countries) by varying amounts for more than 60 years to prevent cavities. These assumptions were later dismissed by hundreds of scientific publications which showed that internal consumption of fluoridated water had no effect on tooth decay.
In recent years, fierce debate over the safety of water fl...