Background: During the orthodontic treatment, the friction between the bracket and the archwire could prevent the action of forces required for a particular tooth movement. Olive oil (OO) is a fundamental component of the Mediterranean Diet. .It was worthy to determine the effect of the local application of olive oil on decreasing the friction between brackets and wires during orthodontic treatment.Aim & Objectives: To detect the effectiveness of local usage of Olive Oil on orthodontic brackets during the alignment phase of orthodontic treatment in decreasing the duration of teeth alignment .patients and methods:110 Patients were randomly allocated to two groups: the control group, where no olive oil was applied, and the patients, who were restricted from using Olive Oil in their food. The second group is the intervention group, where the patients were instructed to apply Olive Oil locally with a bond brush over the orthodontic brackets five times daily after each teeth brushing. results: Regarding the control group, little's irregularity index began with a mean (5.59 mm ± 0.60) and decreased to (0.71mm ± 0.48), while in the intervention group; little's irregularity index began with a mean (5.48 mm ± 0.58) and decreased to (0.07 mm ± 0.08). Conclusion:Local application of Olive Oil decreased the alignment phase duration. Local application of Olive Oil decreased the surface roughness of the used arch-wires during orthodontic treatment.