It is the gateway to dentistry where the treatment planning and findings of a patient with oral and dental health problems are determined. It is the branch of dentistry that examines the diseases, abnormalities, developmental defects of the mouth, teeth, gingiva and surrounding tissues, investigates the diagnosis and treatment criteria, and plans the treatment of all patients with oral and dental health problems. As in general medicine, this branch uses different laboratory methods for the definitive diagnosis of diseases. Dentistry radiology is one of the sub-branches of this branch.