Samuel Dorn speaks about basic procedures for several endodontic emergencies. He presents the different types of possible urgent situations and explains the steps that need to be taken, in order to accomplish a successful treatment and recovery. He begins by discussing the importance of obtaining a correct diagnosis for each patient, following a specific methodology, helpful for collecting facts and data assertively. Dorn proceeds to describe useful and common clinical exams, pointing out their strengths and weaknesses. Due to the variety of testing options, as well as the technological advances, he makes significant remarks on techniques and procedures that currently are losing popularity and certainty. Finally, Dorn goes through a simplified explanation of pathology, focused on cavities and the recurring stages.