Evaluate the possible apical root resorption during deep bite correction by double slot bracket with low level slot versus high level slot using CBCT.

Group (A): Patients will be treated with double slot brackets using low level slot in deep bite correction. Group (B): Patients will be treated with double slot brackets using high level slot in deep bite correction.

Inclusion Criteria:

1. Female patients to avoid any sexual dimorphism which may affect the comparison.
2. Age range from 18 to 23year.
3. Patients with anterior dento alveolar deep bite.
4. Angle class I or class II malocclusion with minimal crowding.
5. Healthy compliant and motivated patient.
6. No missing of any tooth except wisdom teeth

Exclusion Criteria:

• 1. Previous orthodontic treatments. 2. Any systemic or bone diseases. 3. Pregnant and lactating patient. 4. Prosthetic replacement in lower anterior teeth. 5. periodontitis with pocket depth more than 5 mm