This is added to drinking water and prevents tooth decay
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Copper
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Iodine
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Flouride
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Calcium
C
Correct answer
Explanation
Fluoride is commonly added to public drinking water supplies to help prevent dental cavities (tooth decay) by strengthening tooth enamel. While calcium is also important for teeth, it is not typically added to municipal drinking water for this purpose. Note that "fluoride" is misspelled as "Flouride" in the options.