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Do your research... You obviously haven't. Look up fluorodosis. Cyanide occurs naturally too, do you want some for breakfast?

almonds.
millet sprouts.
lima beans.
soy.
spinach.
bamboo shoots.
cassava.

all these foods have cyanide, yet they are perfectly healthy to eat. Again. The important factor is the dosage. Not the substance itself.

And what is your daily dose of fluoride? What is the dose when you take a shower? How about the dosage your kid gets soaking in the bath? Or what about the fact that fluoride affects different ethnicities differently? Never mind all that, one dose for all!