Acquired deep overbite may be caused by following factors: a)A lateral tongue thrust or postural position produces an infra occlusion of the posterior teeth with large freeway space, favourable for functional appliance treatment.
b)Premature loss of decidous molars or early loss of permanent posterior teeth can cause an acquired secondary deep bite, particularly if the contiguous teeth are tipped into extraction sites.
c) The wearing away of the occlusal surfaces or tooth abrasion can produce an acquired secondary deep over bite.