Why do children in southern Marin County have fewer cavities than children in northern Marin County?

A significant public health achievement, the fluoridation of drinking water is credited with a dramatic decrease in tooth decay. In Marin County, this practice dates back to a 1972 voter initiative that led to the fluoridation of water for most communities. This decision has resulted in a noticeable difference in the oral health of children between the southern and northern parts of the county. The Marin Municipal Water District, which serves central and southern Marin, adds fluoride to its water supply.

Conversely, the North Marin Water District, which supplies water to areas like Novato and West Marin, does not fluoridate its water. While a state law passed in 1995 required larger water systems to fluoridate, the funding allocated for these projects was insufficient to cover all communities. Novato and West Marin were on the list for fluoridation, but the funds were exhausted before the infrastructure could be built. This has created a tale of two counties when it comes to dental health.

The presence of fluoride in the water in southern Marin helps to strengthen tooth enamel and prevent cavities in children who drink it regularly. The lack of this preventative measure in the northern part of the county is a primary contributor to the higher rates of dental caries observed in children there. This public health disparity highlights the impact that community-wide preventative measures can have on the well-being of its youngest residents.