.........Valdez-Jimenez et al (2011) showed that fluoride is capable of crossing the blood-brain barrier and accumulating in the brain of the foetus. They conclude this may cause functional and biochemical changes in the nervous system. This can have a profound effect on the neurological and mental development, impacting cognitive processes such as learning and memory. Developing brains are also more susceptible to the effects of any drug. Harvard researchers published a study last year which concluded that children who live in areas with high water fluoridation have significantly lower IQ scores than children living in low fluoridation areas (Choi et al, 2012). This study is significant because it was a meta-analysis of 27 published studies over 22 years looking at increased fluoride exposure in drinking water and neurodevelopmental delays.