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Note: Fluoride is safe in the amounts provided in water supplies but can be toxic in large amounts. Toxic levels depend on your child's weight. A lethal dose of fluoride for a 3-year-old child is 500 mg and is even less for a younger child or infant. Keep all products containing fluoride, such as toothpastes and mouthwashes, away from children. If you think your child may have swallowed too much fluoride, call your local poison control center or the National Poison Control Hotline right away at 1-800-222-1222. I trust WebMd when it comes to medical/health issues. That's where the above came from for those wanting to know about fluoride and children.