This book helps clinicians and postgraduate students to better understand the evidence in orthodontics and to use an evidence-based approach in their clinical practice. The book is written in a question-and-answer style, and each question is answered according to the hierarchy of evidence. At the end of each answer, an interpretation of the included systematic reviews, randomized clinical trials, or other studies is summarized and critically reviewed to give a better understanding of the evidence. This book covers a wide range of clinical topics, such as the treatment of Class II and Class...