Prevalence and Severity of Dental Fluorosis in the United States, 1999-2004
"Key findings
Data from the National Health and Nutrition Examination Survey, 1999-2004 and the 1986-1987 National Survey of Oral Health in U.S. School Children

Less than one-quarter of persons aged 6-49 in the United States had some form of dental fluorosis.
The prevalence of dental fluorosis was higher in adolescents than in adults and highest among those aged 12-15.
Adolescents aged 12-15 in 1999-2004 had a higher prevalence of dental fluorosis than adolescents aged 12-15 in 1986-1987..."