This is the fourth edition of textbook of oral medicine. The book has received over the years from educators, students and practitioners. This edition includes a lot of changes. For easy understanding of the concepts, flowcharts have been incorporated. Summary has been added at the end of each br>Chapter which will help in quick revision of the br>Chapter during crucial hours of examination. Many new figures have also been added with improved clarity to understand the subject in better way. Gene therapy is added in br>Appendix 7 which is essential to broaden up the knowledge of students.