As the field of orthodontics expands and progresses towards a more advanced future, we experience the metamorphosis of an obscure and unknown sect in dentistry into a highly advanced, technological field. The universal aim, of course, creating an easier and more efficient way, as well as more comfortable for the patient, route to the perfect smile. Non-extraction orthodontic treatment implies the correction of malocclusion and thereby improves facial profile, aesthetics and smile without sacrificing permanent tooth/teeth. The decision of whether or not to extract permanent teeth in planning the treatment of an orthodontic case is a crucial moment for the clinician, especially when facing borderline cases.