Occlusions are among the problems of public health due to their high epidemiological dimension in the childhood phase and are considered by the World Health Organization the third odontological problem. Among them are the crossbites, which, if not treated early, may lead to craniofacial alterations in adulthood, compromising the structures of the stomatognathic apparatus. The objective of this study was to report the clinical case of a male child with a functional unilateral posterior crossbite, treated by the planas direct tracks technique. The clinical case refers to a 3-year-old patient, with a left unilateral posterior crossbite and with midline deviation. Following the protocol of neuro-occlusal rehabilitation with the use of Planas Direct Tracks, wearings were performed on the occlusal interferences of the 63 tooth and the confection of slopes in inclined planes using composite resin, which was installed on the upper tooth of the crossed side, in order to promote the occlusal balance. After 31 days of treatment, there was bite uncrossing and midline leveling. We conclude that the favorable clinical outcome has been achieved and that the Planas Direct Tracks technique is effective for the treatment of functional crossbites.