CORRECT-INCORRECT STATEMENT When fluoride ion concentration in water is more than \( 2 \mathrm{p...

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CORRECT-INCORRECT STATEMENT
When fluoride ion concentration in water is more than \( 2 \mathrm{ppm} \) then it causes-
I. Tooth decay
II. Brown mottling of teeth
III. Harmful effect on the bone
Choose the correct statement.
(1) Both I and II
(2) Both II and III
(3) I, II and III
(4) Only I
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