A dental disease characterised by moltting of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that element?

Q. A dental disease characterised by moltting of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that element?

A.            Mercury

B.            Chlorine

C.            Boron

D.            Fluorine

Answer: Fluorine