There's fluoride in the water but nobody know that

from Vinnie Paz (Ft. Block McCloud) – End of Days Lyrics on Rap Genius

Meaning

Referring to the fact that many municipalities fluoridate their public water. For more than 50 years fluoride has been routinely added to most US municipal water systems in the form of sodium fluoride, fluorosilicic acid, or sodium fluorosilicate. Interestingly most of Western Europe has rejected the use of water fluoridation based on more recent studies and concerns for the health and physical welfare of their citizens.

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