Due to the tensions of WWII and death of Dr. Fisher, the 3rd international congress did not take place in Montreal.
For next three decades, due to Korean and Vietnam War, the organization of the Congress was further delayed.
After Dr. DeKock contacted many different Orthodontic societies around the world by sending them the bylawas of WFO.
5th International Orthodontic Congress was held in Chicago, US, in 2000 along with the 100th session of the American Association of Orthodontists.
6th International Orthodontic Congress was held in Paris, France, in 2005 along with Societe Francaise d’Orthopedie Dento-Faciale and Syndicate des Specialistes Francais en Orthopedie Dento-Faciale.
7th International Orthodontic Congress was held in Sydney, Australia, in 2010 and was sponsored by Australian Society of Orthodontists.