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NEET Sample Paper NEET Sample Test Paper-41

  • question_answer
    High concentration of fluoride is poisonous and harmful to bones and teeth at levels over:

    A) 1ppm               

    B) 3ppm  

    C) 5ppm               

    D) 10ppm

    Correct Answer: D

    Solution :

    Flupride's tolerable limit is 1 ppm?\[\left( Imgd{{m}^{-3}} \right)\]. It protects teeth against decay, but above 2ppm causes brown mottling of teeth. And more than 10 ppm are harmful to bones and teeth. The F~ ions make the enamel on the teeth much harder by converting hydroxyapatite, on surface of teeth into much harder fluloraptite.


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