gwern comments on Water Fluoridation - Less Wrong
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At a guess, it's a precaution: very young children may eat it down as a kind of candy. (Don't all flouridated toothpastes come with warnings against swallowing?)
Not just the very young - my 5 year old son was consuming toothpaste at such a rate that we have had to cut off his formerly unfettered access to it.
No amount of telling him 'eating a tubeful every few days is probably unhealthy' had any effect - he just loves the stuff.