What are fluoride allergy symptoms?

No fluoride allergy: The authors of diatribes on the dangers of Fluoride use ambiguous & misleading terms to scare people about this important anti-cavity substance. Anecdotal reports from >50 yrs ago reported hypersensitive effects to 1 mg of fluoride. Fluoride supplements for children do not contain that much fluoride. The "hypersensitive" status refers to increased sensitivity not true allergy in these rare cases.

Rare: A true allergy to Fluoride is rare. Fluoride is an element. It is more likely that a "fluoride" allergy is a reaction to another ingredient in the compounded fluoride. Redness, itching, rash are all possible reactions but again, more likely caused by an additive like a preservative.