The newly created U.S. Army Dental Corps, had to deal with a huge recruitment of troops after the Japanese attack of Pearl Harbour.Initially quickly overtaken by events, they gradually made up their lack of staff by the massive training of army dentists, in close co-operation with the American dental schools and by taking on many civil dentists. The lack of dental equipment and material was made up by the increased national output. With these advantages, both the mobile unites at the front and the dental clinics in the rear guard, appointed to the many regiments of differing size, proved to be well organised and successful.