Randy,
Tooth decay in this day and age could be controlled by restricting your children's intake of Soda and Candy. You know it, I know it and parents know it.
Prevention is brushing teeth twice a day minimum, preferably after every meal. 
Each generation gets worse as parents care less about healthy food than their Big screen TV. 
There is no need to pollute an entire community water system. 
Do a survey. People on private Wells vs public water systems and see what you find. People on Wells live out of town. Not so much access to "goodies" for the undisciplined.  Results might be interesting. 
If you are concerned about young children with teeth rotting out their mouths, check out the shopping carts at the grocery store, not the drinking water.