Community fluoridation – considered one of the top public health success stories of the last century – has been banned in Utah, with a new law taking effect Wednesday.

Utah is set to become the first state in the nation to ban fluoride in drinking water, with a new law taking effect later this week, on Wednesday. That day, the fluoride taps will turn off, if they haven’t already.

With Utah’s first-in-the-nation ban on fluoride in public drinking water set to take effect Wednesday, dentists who treat children and low-income patients say they’re bracing for an influx in tooth decay among the state’s most vulnerable.