Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?
Correct answer: B. Dental cavities
- A. Scale formation
- B. Dental cavities
- C. Water-borne disease
- D. Corrosion
Explanation
Fluoride at a controlled low concentration strengthens developing tooth enamel and reduces dental cavities. Excess fluoride, however, can cause fluorosis, so the question refers to a minimum desirable amount.
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