Assertion: fluoride's water | /r/MadeOf | 4 ppm
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text: Marcus (Carton & Marcus 1990) quoting an earlier study notes that people accumulate up to 7,000 ppm of fluoride in their bones, when ingesting water containing 4 ppm (the EPAs Maximum Contaminant Level or MCL), while the high dose rats had only 5,470 ppm.