To compare the treatment time required by elastomeric ligatures and steel ligatures, in days, to achieve complete alignment of the lower anterior teeth.

Treatment time required to achieve alignment by two ligation methods will help us in future to choose a better method. The two methods study are elastomeric ligature and steel ligature.

Inclusion Criteria:

1. Patients coming for fixed orthodontic treatment requiring premolar extraction in mandibular arch.
2. Age 12-18 years.
3. No adjunct therapeutic intervention involving functional or orthopaedic appliances.
4. Little's Irregularity index score of 7-9mm.

Exclusion Criteria:

1. Patients with systemic conditions and taking medications affecting tooth movement.
2. Lower anterior teeth that are missing, impacted or unerupted, or have fractured crown, restorations, Enamel Defects, Caries.
3. Poor periodontal health