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QUESTION
Q287) A dental disease characterised by mottling of teeth due to ingredient in drinking water namely ...[CBSE 1995 ]

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Dental fluorosis is a common disorder, characterized by hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation.
When fluorosis is moderate, all of the surfaces of the teeth are mottled and teeth may be ground down and brown stains frequently "disfigure" the teeth
Answer : (a)