Question

A dental disease characterised by mottling of teeth is due to the presence of certain chemical element in drinking water. Which of the following is that element?

• A. Fluorine
• B. Boron
• C. Mercury
• D. Chlorine

Answer 1

The Correct Option is A

The correct option is(A): Fluorine.
Excess fluoride in drinking water causes teeth deformity.

Answer 2

Explanation: 

• The correct answer is fluorine, because
• Consuming excess fluoride while teeth are forming can lead to dental fluorosis, which causes mottling of the teeth.
•  Dental fluorosis is a condition where a developmental defect occurs in tooth enamel.
•  It may appear as faint white flecks, patchy white areas, or brown spots on the teeth.
• While appropriate levels of fluoride in drinking water can help prevent tooth decay, only excessive amounts can lead to dental fluorosis.
•  The optimum level of fluoride presence in water is 0.7–1.2 ppm.

Thus, the right answer to this question is fluorine.