Discussion
Fluoride in water mainly affects :
Answer: A
Fluoride in water mainly affects the teeth.
Small amounts of fluoride (around 1 mg/L) protect teeth against decay, but above about 1.5 mg/L, the BIS limit for drinking water, it causes dental fluorosis: mottled, chalky or brown-stained enamel. Long exposure to higher levels causes skeletal fluorosis, with stiff joints and bone deformities, a problem in parts of Rajasthan, Andhra Pradesh and other states.
The brain, muscles and kidneys are not the main targets. Kidney damage is more typical of cadmium, and nervous system damage of lead and mercury.
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