In an announcement made by The U.S. Department of Health and Human Services (HHS) and the U.S. Environmental Protection Agency (EPA), fluoride levels in water will be adjusted to prevent excessive exposure, which can lead to a condition known as fluorosis especially in children age 8 and under as teeth are still forming. Dental fluorosis is most often very mild in U.S. cases, showing up as barely visible lacy white marks or spots on tooth enamel. More severe forms of dental fluorosis that cause dark staining and pitting of the tooth, is extremely rare in the U.S.