Summary: The issue of transversal malocclusions has been widely studied bymany authors around the world and researched from many perspectives: skeletal, muscular, dental andfunctional. Reports describe the different etiologies, complications and compromises ofmalocclusion, leading to a general consensus that, the sooner it is corrected, the less theirconsequences and negative effects on growth and development will be, and good results can beachieved with great long-term stability. Therefore the aim of this paper is to identify through aliterature review, the necessary tools that allow the detection, diagnosis and treatment of thesemalocclusions at an early stage and to prevent severe skeletal asymmetries. Key words: Transversalmalocclusions. Cross-bite. Unilateral posterior crossbite. Bilateral posterior. Crossbite. Planasdirect tracks. Early transverse treatment.