Toxicological trivia from October 09, 2013: Fluoride is a substance common in many minerals due to their natural occurrence in water. Spanish law limits the maximum amount in human consumption, including power supply, in the same guideline of the World Health Organization. In slightly larger amounts, consumption is discouraged in children, whereas if the numbers are very high, this preventive measure is extended to the entire population, as it may cause adverse health effects, in particular, in the bones. The numerical limit is:a) 0.5 mg / l;b) 1.0 mg / l;c) 1.5 mg / l.

Correct answer c. Enlarge with Spanish article: To remove fluoride from natural mineral waters and spring waters in the EU