Given below are two statements, an Assertion (A) and a Reason (R). Choose the correct answer.
Assertion (A):Fluorosis is a condition that results in white or brown speckles on the teeth.
Reason (R):Fluorosis is caused by overexposure to fluoride in the early years of life, when the permanent teeth are developing and the fluoride concentration in water exceeds about 1.5 mg/l.
ABoth (A) and (R) are true and (R) is the correct explanation of (A) ✓ Correct
BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
C(A) is true, but (R) is false
D(A) is false, but (R) is true
Correct answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A)
Explanation
Both statements are true and the reason correctly explains the assertion about dental fluorosis.
The assertion is sound: fluorosis produces white or brown speckles on the teeth.
The reason is sound: it stems from excess fluoride during early childhood tooth formation when water fluoride tops about 1.5 mg per litre.
Because too much fluoride during enamel development mottles the teeth, it directly accounts for the speckling.
Skeletal fluorosis from prolonged high intake can also stiffen and deform bones.
The permissible fluoride limit in drinking water is around 1.0 to 1.5 mg per litre.
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