Attitudes have changed dramatically over the last few years. Both patients and practitioners want to know more about the treatments given and the agents that put them at risk of disease. Will a treatment work? Is this the best available treatment? Can anything be done to prevent a particular disease? The ability to answer these questions is inherently dependent upon the ability to read and interpret the dental literature. This is why it has become increasingly important for students and practitioners to be proficient in the area of evidence based dentistry and critical appraisal. The purpose of this book is to allow periodontists to gain confidence in their own ability to assess research reports and overcome the misconception.