I am pleased to present to users the Edition of ORAL BIOFILM "SYMBIOTIC TO PATHOGENIC INTERACTION AND ASSOCIATED DISEASES" for Dental students with thoroughly updated contents. The book attempts to incorporate the knowledge about the microorganism that harms the intraoral soft & hard tissues and also deals how to diagnose and to prevent the future loss of tooth supporting structures. The volume of literature available in dentistry today is vast. However, during both our graduation as well as postgraduation, we always felt the need for a book which would help us to revise and update our knowledge. Emphasis is laid upon the language which is simple, understanding and exclusively designed for undergraduates, postgraduates, practitioners and teachers in the field. I await the response of this first edition, which would improve the next editions to come.