> There is *nothing* that is not lethal if consumed in sufficient quantity.
To be fair, the quantity of fluorine that would kill you if you consumed it is too small to notice. What's saving you from the fluoride isn't that there isn't enough fluorine to be dangerous - it's that the fluorine is accompanied by things that make it less dangerous.
Table salt is 60% highly toxic chlorine, but you're free to coat your food in it because it's 40% sodium, too. In combination, they're fine and in fact necessary to life. Consumed separately in equal amounts, either would kill you. The quantity isn't what matters.
To be fair, the quantity of fluorine that would kill you if you consumed it is too small to notice. What's saving you from the fluoride isn't that there isn't enough fluorine to be dangerous - it's that the fluorine is accompanied by things that make it less dangerous.
Table salt is 60% highly toxic chlorine, but you're free to coat your food in it because it's 40% sodium, too. In combination, they're fine and in fact necessary to life. Consumed separately in equal amounts, either would kill you. The quantity isn't what matters.