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Dental fluorosis — a condition that occurs when teeth get too much fluoride and appear to be stained — was also used to assess exposure.

There's widespread scientific agreement that ingesting too much fluoride can cause teeth to have a mottled appearance or become pitted, a condition called dental fluorosis.

If breastfeeding is not possible, the CDC also endorses using fluoridated water in infant formula, though it suggests mixing the formula with low-fluoride bottled water to lessen the risk of dental fluorosis.

Opponents of fluoridation have since raised concerns both ludicrous — fluoridation is not a communist plot — and legitimate, such as fluorosis.

But too much fluoride when teeth are forming can lead to tooth streaking or spottiness - known as dental fluorosis.