| fluorine |
Used commercially in the form of sodium fluoride it is a dangerous free radical, and one of the 100 most toxic substances known to exist. Sodium fluoride has been and is being added to municipal drinking water, toothpaste and is used to treat the teeth of children in an attempt to prevent dental cavities. There have been cases of children being injured or even dying from fluoride poisoning as a result of accidentally swallowing their fluoride treatment while in the dentist chair.
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