The current clinical study will be done for evaluation of maxillary canine retraction assisted with application of two different methods of low-intensity pulsed ultrasound.

Inclusion Criteria:

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All patients should satisfy the following criteria:

1. An age ranges from 15-22 years.
2. Severe crowding or protrusion requiring 1st premolar extractions followed by symmetrical canine retraction.
3. All permanent teeth present, 3rd molars are excluded.
4. Good oral hygiene.
5. No systemic disease/medication that could interfere with orthodontic tooth Movement (OTM).
6. No previous orthodontic treatment.

Exclusion Criteria:

• 1. Patient diagnosed to have an indication for non-extraction approach. 2. Poor oral hygiene or periodontally compromised patient. 5 3. Patient with craniofacial anomalies or previous history of trauma, bruxism or parafunctions. 4. Previous orthodontic treatment. 5. Any implanted assistive devices (e.g., pacemakers, cochlear implants, etc.) 6. Pregnant females.