The document discusses case histories, which contain relevant information about individual clients maintained by various professional organizations. Case histories aim to achieve correct diagnoses, communicate with patients, inform them of their situation, design treatment plans, and determine prognoses. Taking a thorough case history through interview or questionnaire is important for assessing risks to the patient and dentist, and for establishing diagnoses to prevent issues. A case history includes statistics, chief complaint, history of present illness, medical history, dental history, personal history, examinations, diagnoses, treatment plan, and personal information.