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

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

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

Mottling of teeth is due to presence of an element in drinking water. This elements :