This manual has been written for the undergraduate students in the College of Dentistry, King Saud University. It has been in use in the Division of Oral Diagnosis clinical teaching for several years. During this period, it has undergone several amendments to accommodate changes were found necessary. The main objective of this manual is to prepare the undergraduate student dentist for all aspects of patient interviewing, examination and evaluation in regard to early diagnosis of dental diseases, and to develop a good dentist patient rapport.