Building upon earlier research published in 2006 that dubbed fluoride as a "developmental neurotoxicant," the new review included a meta-analysis of 27 additional studies on fluoride, most of which were from China, that linked the chemical to lowered IQ in children. After thorough analysis, it was determined that fluoride obstructs proper brain development and can lead to autism spectrum disorders, dyslexia, ADHD and other health conditions, a "silent epidemic" that many mainstream health authorities continue to ignore.