| 1930s—ADA has more than 36,000 members, representing about half of U.S. dentists, and 85% of the market share by the end of the 1940s.
1930—Council of Dental Therapeutics is established to oversee the evaluation of dental products.
1931—The Council of Dental Therapeutics establishes the ADA's Seal Program and awards the first ADA Seal of Approval to a brand of cod liver oil recommended as a food supplement to promote strong teeth and healthy gums.
1931—ADA’s Central Office is relocated from rented space to a building it purchased on East Superior Street, Chicago making it the first permanent headquarters building established by the ADA.
1934—ADA adopts policies of social principle and ventures into a project with the U.S. Public Health Service to give dental examinations to 1.5 million children in 26 states.
1934—ADA president Dr. C. Willard Camalier addresses political and military issues, and recommends the establishment of a Washington D.C. office.
1936—ADA Council on Dental Education is formed to oversee the educational standards of dental professionals and the accreditation of dental schools and educational programs.
1940s—Under Roosevelt's "Good Neighbor" policy, the ADA extends Annual Session invitations to Latin America, Mexico, and Canada.
1941—Cleveland Dental Society establishes National Children's Dental Health Day. The observance becomes a national observance under the auspices of the ADA in 1949.
1942–45—During WW II, ADA secures preferential purchase of automobiles, gasoline and dental supplies for civilian dentists.
1942—Harold Hillenbrand joins the ADA staff as assistant editor of JADA. He becomes the Secretary of the ADA (the position known as Executive Director today) in 1946 and holds the position for the next two decades, retiring at the end of 1969. During his tenure as Secretary/Executive Director Dr. Hillenbrand leads the ADA in becoming one of the premier professional organizations in the world, during a period of the greatest growth and development that the dental profession has ever known.
1943—ADA headquarters moves to a larger building at 222 Superior Street in Chicago.
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