priority" in countries like the U.S. where, despite mass fluoridation programs, no studies have yet been conducted to investigate the issue. As noted by Dr. Philippe Grandjean , an environmental health scientist at the Harvard School of Public Health: "Fluoride seems to fit in with lead, mercury, and other poisons that cause chemical brain drain. The effect of each toxicant may seem small, but the combined damage on a population scale can be serious, especially because the brain power of the next generation is crucial to all of us."