Question

Fluoride content of water which causes fluorosis is

• A. 6 ppb
• B. 100 ppb
• C. 1 ppm
• D. 10 ppm

Answer 1

Answer: (D)

10 ppm

The presence of fluoride in the drinking water causes a condition called fluorosis in which the teeth appear yellow to dark brown, show surface irregularities and presence of noticeable pits. It is caused majorly when an individual is exposed to a concentration of 10 ppm of fluoride in the water during the formation of the permanent teeth. Hence, the correct answer is '10 ppm'.