The book has been written as per the prescribed syllabus for BDS students by the DENTAL COUNCIL OF INDIA(DCI). The textbook has been updated and thoroughly revised to include new medically ? relevant features. The text is presented in a simple and lucid manner. Real color plates and diagrams have been incorporated at appropriate places. A new and upcoming topic ?Hand Hygiene? has been modified to understand the importance of hand hygiene. New Biomedical waste guidelines have been included to understand proper disposal of biomedical waste. A new chapter ?Essentials of Microbiology at Glance? has been incorporated to recapitulate the important aspects of Microbiology in no time. A complete unit on ?Clinical Microbiology? has been included to understand the role of Microbiology in patient care. ?Key Points? have been included at the end of each chapter for easy and quick recapitulation.