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.

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.