Patients who have moderate crowding that could be treated on a non-extraction will be treated in this study. The apical root resorption and alveolar bone height of the lingual and labial fixed appliances will be assessed. All patients will receive a cone-beam computed tomography (CBCT) scan at two different times (T0: Before treatment, T1: After treatment).
There are two groups: The first group (Experimental): The patients in this group will be treated using Lingual Fixed Orthodontic Appliances. The second group (Control): The patients in this group will be treated using Labial Fixed Orthodontic Appliances.