New York State Department of Health dentist J. V. Kumar published national statistics in the July 2009 JADA which show similar cavity rates regardless of water fluoride content, However, dental fluorosis rates increased along with water fluoride levels. See analysis “Fluoridation No Benefit; Definite Harm,” by Kathleen M. Thiessen, Ph.D., SENES Oak Ridge, Inc., Center for Risk Analysis here:

http://www.newmediaexplorer.org/chris/Clinch_2009_No_Benefit_Definite_Harm.pdf