Inclusion Criteria:  Adults patients aged between (16 - 28) years. Class I malocclusion with Mild crowding (1 - 4) mm in the anterior region of the mandibular dental arch All lower teeth are existed (except for third molars). No congenitally missing or extracted teeth (except for third molars) Patients have not undergone previous orthodontic treatment. Patient with good oral hygiene (Plaque Index less than 1). With no severe skeletal discrepancy.  Exclusion Criteria:  Bimaxillary dentoalveolar severe protrusion. Any systemic diseases affect teeth movement. Bad oral hygiene. Patient lack of commitment toward follow-up appointments.