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Mass intoxication from accidental overfluoridation of drinking water.

The literature reveals several episodes of acute mass poisoning due to sodium fluoride which had been mistaken for flour, sugar, and baking powder and added to food [1]. The number of persons affected ranged from 5 to 280. The most severe accident -with 47 deaths occurred in Salem, Oregon, where a helper in the kitchen mistakenly had added 17 Ib of a roach powder containing 90% sodium fluoride to a 10-gal mixture of scrambled eggs. In other cases the doses of fluoride involved were estimated to