Chicago, IL
Try your search engine on your computer. Enter 'American Dental Association' and see what comes up.
The contact information is as follows: American Dental Association 211 East Chicago Ave. Chicago, IL 60611-2678 312-440-2500 Their website addres is: http://www.ada.org/
http://www.ada.org/prof/ed/programs/search_ddsdmd_us.asp