A transverse dimension deficiency is most often the result of functional disorders. Poor
tongue posture at rest and during function as well as digit-sucking give rise to
deficiencies which are initially alveolar but which, with time, frequently end up becoming
skeletal. The combination of functional rehabilitation and transverse dimension treatment
is the best way to avoid many relapses. We need to monitor this anomaly closely, from
diagnosis to retention. Otherwise, failure awaits us.