Treatment duration depends on the correction that has to be done. Generally, it takes 1.5-2 years to move teeth. It may depend on patient’s growth and compliance. Having regular check ups, good oral hygiene are good ways to end up treatment on time. In permanent dentition, at the end of each treatment, there is always a retention phase without any appliance, just an invisible retainer (lingual archwire bonded on the inside part of the teeth).