A subcommittee of the National Research Council's (NRC) Committee on Toxicology (COT) will review toxicologic, epidemiologic, and clinical data, particularly data published since 1993, and exposure data on orally ingested fluoride from drinking water and other sources (e.g., food, toothpaste, dental rinses). Based on those reviews the subcommittee will evaluate independently the scientific basis of the U.S. Environmental Agency's (EPA) maximum contaminant level goal (MCLG) of 4 milligram per liter (mg/L) and secondary maximum contaminant level (SMCL) of 2 mg/L in drinking water.