Mottling of teeth is due to presence of an element in drinking water

Mercury

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Fluorine

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Boron

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Chlorine

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Solution

The correct option is A Fluorine
Fluorine is a chemical element characterised as halogen in the periodic table with atomic number 9 and symbol F. The excess of fluorine in water cause fluorosis which causes mottling of teeth (yellowish blotches or stains). It is an endemic disease known to be caused by hypomineralisation of tooth enamel caused by ingestion of excessive fluoride during enamel formation.
Hence, the correct answer is 'Fluorine'.

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