This document provides an overview of endodontic diagnosis and treatment planning. It discusses the importance of gathering a chief complaint, health history, dental history, and conducting a subjective and objective examination of the patient. The subjective examination involves questioning the patient about their symptoms such as the intensity, spontaneity, and persistence of any pain. The objective examination includes extraoral and intraoral soft tissue exams, examining the dentition, and performing clinical tests like percussion, palpation, and pulp vitality tests using heat, cold, or electricity. Together, the subjective and objective exams allow the clinician to make a tentative diagnosis which is then confirmed through further examination and testing.