Lower incisor crowding ( L.I.C ) is identified as the discrepancy between mesiodistal tooth widths of four permanent incisors and available space in the alveolar process. However, incisor crowding is not merely a tooth-arch size discrepancy. Many factors such as incisor inclination can be affect crowding development. the aim of search. Was studying effect of mandibular anterior crowding on maxillary and mandibular incisor position in the early mixed dentition.