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　　Main article: Fluoride poisoning

　　At least 17 incidences of fluoridation equipment malfunction, and their associated deaths and poisonings, have been documented in U.S. newspapers and medical journals.[75] The largest incident occurred in Hooper Bay, Alaska in 1992. When fluoridation equipment failed, a large amount of fluoride was released into the drinking water supply and 296 people were poisoned; 1 person died.[75] 3 dialysis patients died and 6 were sickened at the University of Chicago Hospitals when the water filtration system failed on July 16, 1993. A hospital spokesperson said that the deaths and reactions “were consistent with fluoride exposure.”[75]

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