Management of any problem starts with an accurate diagnosis and this is not different in the field of endodontics . Diagnostic techniques are designed to distinguish dental pain from pain of non-odontogenic origin and then within the realm of dental pain, to locate the offending tooth and determine if the problem is pulpal or periodontal. The diagnosis of dental pulp status should be seen as a synthesis of history, clinical examination, special tests, and radiological examination, and not as the outcome of any one specific test. Endodontic diagnosis is enhanced by newer technologies The style of this improvement is targeted towards increasing the objectivity sensitivity and reproducibility of the pulp tests while decreasing the patient's discomfort. This book describes the various available technologies to aid the dental practitioner in detecting a tooth with a relevant endodontic disease. It also describes the need and limitation of the technologies as an aid in our management of endodontically affected tooth.