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Prolonged use of drinking water having a fluoride concentration well above 2 ppm causes:

  1. Ablue baby syndrome
  2. Banaemia due to inhibited haem synthesis
  3. CMinamata disease
  4. Dmottling of teeth (dental fluorosis)

Answer: D

Excess fluoride causes brown mottling of teeth and, at higher levels, skeletal damage. Blue baby syndrome is due to excess nitrate.
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