Q. Which one of the following is a major effect of long term consumption of drinking water containing little (less than. 5 PPM) or no fluoride

A
cavity of tooth
B
erosion of nail
C
deformation of bone
D
Mottling of tooth
Solution:

Fluoride helps prevent tooth decay by making the tooth more resistant to acid attacks from plaque bacteria and sugars in the mouth. It also reverses early decay.

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