What is the recommended maximum level of fluoride in drinking water?

The recommended maximum level of fluoride in drinking water is established by health authorities to prevent dental issues while minimizing health risks. The value that is commonly accepted is 4.0 mg/L. This level is based on scientific studies that have shown this concentration to be beneficial in reducing cavities while not posing significant health risks.

Higher levels of fluoride, such as those in the other choices, can lead to dental and skeletal fluorosis, which are conditions resulting from excessive fluoride intake. Therefore, keeping fluoride concentrations at or below 4.0 mg/L ensures that the benefits of fluoride in promoting dental health are achieved without incurring any serious health concerns.

This guideline reflects a balance between the positive effects of fluoride on oral health and the importance of safety in public health policy.