What should be the minimum concentration of fluoride in community water supplies according to health guidelines?

The minimum concentration of fluoride in community water supplies recommended by health guidelines is 0.7 mg/L. This level is determined based on the need to balance the benefits of fluoride in preventing dental caries with the risk of dental fluorosis, which can occur at higher concentrations.

The guideline reflects current research indicating that this concentration provides optimal protection against cavities for all age groups while minimizing adverse effects. It is particularly important as water fluoridation contributes to systemic fluoride exposure during tooth development, effectively promoting stronger enamel formation and reducing the incidence of tooth decay.

This concentration has been adopted by various health organizations, including the U.S. Centers for Disease Control and Prevention (CDC) and the American Dental Association (ADA), as the optimal level for public health measures.