Question: In the early 1 9 3 0 s , it was observed that people living in the southwestern U . S . , where the

In the early 1930s, it was observed that people living in the southwestern U.S., where the water naturally contained high concentrations of . had fewer cavities.
sulfur
sodium
fluoride
chloride
In the early 1 9 3 0 s , it was observed that

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