A dental disease characterised by mottling of teeth is due to the presence of an ingredient in drinking water, namely

Fluorine

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Mercury

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Boron

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Chlorine

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Solution

The correct option is A Fluorine
A dental disease characterised by mottling of teeth is due to the presence of an ingredient in drinking water, namely fluorine. Dental fluorosis or mottling of tooth enamel is a developmental disturbance of dental enamel caused by the consumption of excess fluoride during tooth development. The risk of fluoride overexposure occurs at any age but it is higher at younger ages.
Therefore, the correct answer is option A.

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