Many studies over time have proved the effectiveness of water fluoridation.

The city of Antigo became the focus of a state study to test fluoride as a preventive of dental decay after residents pushed through a 1960 referendum repealing fluoridation and removing it from the public water supply.

After only four years, cavities had increased a jarring 92 percent among kindergarten children, 183 percent among second-graders and 41 percent among fourth-graders.

In light of the results, Antigo promptly resumed fluoridating its public water supply and rates of tooth decay significantly decreased.