The present study will be directed to evaluate the effect of low-level laser therapy on root resorption during orthodontic intrusion of upper incisors.

Inclusion Criteria:

• Patients with age range between 12-16 years.

  • Overbite > 40% indicated for maxillary intrusion.
  • Mild to moderate crowding of upper incisors.
  • All permanent teeth erupted (excluding 3rd molars).
  • No previous orthodontic treatment.
  • Good oral hygiene with no previous periodontal surgery

Exclusion Criteria:

• Transverse and/or vertical skeletal dysplasia or craniofacial malformation.

  • Retained primary or missing permanent teeth in the maxillary anterior area, and any kind of tooth/root shape anomaly.
  • Patients with root resorption, impacted canines, or dental anomalies.
  • Poor oral hygiene
  • Present or history of periodontal diseases.
  • Systemic diseases or regular use of medications that could interfere with orthodontic tooth movement.
  • History of trauma affecting the maxillary incisors.
  • Endodontically treated upper anterior teeth.