Case Studies in Dental Hygiene, Third Edition, is designed to guide the development of criti-cal-thinking skills and the application of theory to care at all levels of dental hygiene education-from beginning to advanced students. This textbook is designed to be used throughout the dental hygiene curriculum. Because the questions and decisions regarding treatment of each case span the dental hygiene sciences and clinical practice protocols, this book will find a place in enhanc-ing every course required of dental hygiene students. Introducing this text at the beginning of the educational experience may help the student realize early on the link between theory and patient care. Students then progress through the program with a heightened awareness of evidence-based practice.   Students also perceive an increase in confidence regarding preparation for board examina-tions when they have been given the opportunity to practice case-based decision making. Case Studies in Dental Hygiene, Third Edition, is a viable study guide to help students prepare for suc-cess on national, regional, and state examinations with a patient care focus. This revised edition also is an excellent review text for the graduating dental hygiene student who is preparing to take the National Board Dental Hygiene Examination.