Solid sodium flouride is toxic because it produces HF gas on contact with water or even mositure.
HF gas is highly toxic and eats the calcium in your bones and you die of organ failure as your body becomes calcified or the build up of fluid in your bones.
NaF mixed at low amounts helps fight gum disease and tooth decay both of which have been implicated in heart disease and tooth decay.
After people starting adding flouride to the water supply in the UK tooth decay in virtually children disappeared.
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