DefinitionFluoride is a chemical commonly used to prevent tooth decay. Fluoride overdoseoccurs when someone accidentally or intentionally takes more than the normal or recommended amount of this substance.This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.See also: Fluoride in dietPoisonous IngredientFluorideWhere FoundFluoride is found in many over-the-counter and prescription products, including:Certain mouthwashes and toothpastesCertain vitamins (Tri-Vi-Flor, Poly-Vi-Flor, Vi-Daylin F)Fluoridated waterSodium fluoride liquid and tabletsFluoride may also be found in other household items, including