It has been my great ambition for long time to bring out a Suitable book in for Dental students; my intention was to provide them relevant materials in a suitable form for easy Understanding. I spent a lot of time and burnt the midnight oil, to fulfil my ambition and also to fulfil the expectations of my dear students. I have made this book terribly easy to read without much effort. All informations have been presented coherently in a systematic manner. Dental implications have been provided for all chapters. These implications will definitely provide more information on the dental uses of many drugs. Also, it will stimulate the students and dentists to explore more dental uses of pharmacological agents. I am confident and also believe that students and staff will definitely find this book very useful and will certainly enjoy learning the subject. I wish the students, faculties and dentists a bright future in their career. Dr. N. MURUGESH