It is a book of the art and science of distinguishing one disease from another. Knowledge of the differential diagnosis expedites the process of reading a correct diagnosis thus avoiding lot of suffering to the patient. In order to save a tooth from extraction the practitioner should be able to assess, diagnose the disease and treat accordingly. To differentiate two similar dental diseases one needs to know the pros and cons of the specific diseases which will help the students and clinicians. A valuable resource book for students, practitioners and residents.