The Angle-Classification was conceived by E. H. Angle, the founding father of orthodontics, for classifying orthodontic deviations after the first molars have appeared: Angle-Class 1 refers to a neutral occlusion (normal bite), Angle-Class 2 refers to a distal occlusion (back-bite) and Angle-Class 3 refers to a mesial occlusion in the lower molars (forward bite). Although this is a very approximate classification, it is the standard method that is used almost everywhere in the world.