When maxillary incisors do not contact mandibular incisors during occlusion, this is termed:

An anterior open bite is defined by the absence of vertical overlap between the maxillary and mandibular anterior teeth when the posterior teeth are in occlusion. There is a visible gap between the upper and lower front teeth. Common causes include digit-sucking habits, tongue thrusting, and skeletal discrepancies. This is distinct from a crossbite (where teeth are in a reversed buccolingual relationship) or increased overbite (where upper teeth cover too much of the lower teeth vertically).