ABSTRACT Objective: The aim of this systematic review was to analyze the short and long-term spontaneous dentoalveolar changes of the mandibular dental arch after slow (SME) or rapid (RME) maxillary expansion in the mixed and early permanent dentitions. Methods: An electronic search was performed in the following databases: PubMed/Medline. Cochrane Library. Scopus. https://www.diegojavierfares.com/deal-time-Hybrid-Racing-V3-Short-Shifter-Assembly-02-06-RSX-K-Swap-flash-save/