The introduction of cone-beam computed tomography (CBCT) in dentistry is a boon for us. how accurate measurements they can predict is a matter of curiosity for everyone; especially in orthodontics; where we have to take care of root resorption. These resorptions occur in millimeters, so for the detection of such things, it is desirable to know how reliable is that radiographic technique. This study is for determining the accuracy and reliability of CBCT.