Comparison of the Efficiency of Maxillary Canine Retraction Using Aligners Versus Conventional Brackets in Orthodontic Extraction Cases.

Inclusion Criteria: * 1\) Moderate to severe crowding orthodontic patients.( Irregularity index of \<5 mm) 2\) Good oral hygiene. (Patient with periodontally sound dentition). 3\) Patient in permanent dentition between the age range 16 - 40 years. 4\) .Patients requiring extraction of mandibular and maxillary first premolars; 5\) Patients having sound general health Exclusion Criteria: * 1\) Systematic disease. 2\) Poor oral hygiene patients. 3 ) Periodontally affected teeth.