A) Ground water
B) River water
C) Pond water
D) Rain water
Correct Answer: A
Solution :
Fluoride is an ion of the chemical element fluorine, which. So belongs to the halogen group. Floride has a significant mitigating effect against dental cavities, if the concentrations is approximately 1 MG II and cause even skeletal flurosis.You need to login to perform this action.
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