A dental endoscope is a miniature optical diagnostic and treatment instrument comprising a miniature camera, cold-light optical fiber, and display. It can reach concealed areas of the mouth and uses HD imaging and magnification to show small carious lesions on tooth surfaces, interproximal lesions, subgingival calculus, root-canal interiors, cracks, and other issues that are difficult to see unaided. It is used for routine examinations, early caries screening, periodontal-pocket examination, support during root-canal treatment, and peri-implant assessment. Photo and video recording supports clinician-patient communication and clinical records. Its minimally invasive approach, precision, and clear field of view support diagnostic accuracy and treatment safety as an auxiliary tool in modern dentistry.