This chapter describes digital technologies that support the basic goals of diagnosis and treatment as well as provide some information on their efficacy and effectiveness where appropriate. In describing these technologies, it is essential to remember that the most important objective of these technologies is to improve diagnostic acumen and treatment outcomes. Naturally, other goals include efficiency and convenience for the practitioner; however, these additional goals would only be justified if they do not interfere with the first objective and provide safety and cost-effectiveness for the patient. One of the most fundamental processes for endodontic diagnosis is pulp testing. In addition to the objective demonstrations for the importance of magnification in endodontics, endodontic practitioners have found magnification to be useful in identifying calcified. Advanced instrumentation and digital technology continue to improve the techniques used in endodontic diagnosis and treatment.