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water fluoridation
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water-treatment plant
A dentist holds a glass of water while a child with an exaggerated smile reclines in a dental chair. The water glass is circled, and arrows point to it.
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water fluoridation: Media

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Why is fluoride added to drinking water?
When fluoride goes up, tooth decay goes down.
Video: Encyclopædia Britannica, Inc.

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water-treatment plant
A water-treatment plant, New York City.
Tetra Images/Alamy
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