Estimated pediatric preventive dental care supply, in hours per year, by county, Georgia, 2015. Data sources: 2015 National Plan and Provider Enumeration System31 and 2015 Board of Dentistry roster from the Georgia Dental Association.32 The Board of Dentistry roster was used as the initial supply base. The National Plan and Provider Enumeration System data set was used to associate National Provider Index and a taxonomy code to each record in the roster, which allowed for the selection of only those dentists who provided preventive dental care services.