History of the term 4F or 4-F
The term 4F or 4-F started in the Civil War. As both Confederate and Union soldiers were being recruited, there were very few medical or dental reasons for rejection. Quite simply, the battery of tests and screening tools available today simply did not exist back then.
It was noted, however, that in order to properly load a rifle quickly, the gun powder cartridge needed to be ripped open with the teeth. Molars and premolars in the back of the mouth were not sufficient for this task. Only the incisors and canine teeth in the front could be utilized
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