Fact: Research shows community water fluoridation offers perhaps the greatest return-on-investment of any public health strategy. The reduction alone in the cost of filling and extracting diseased teeth and time lost from work to get care more than makes up for the cost of fluoridation.
A study conducted by the Centers for Disease Control and Prevention found it costs 50 cents per person per year to fluoride water in larger communities with more than 20,000 residents. For most cities, every $1 invested in this preventive measure yields approximately $38 in dental treatment costs.
Source: ilikemyteeth.com and CDC