Prolonged orthodontic treatment requires that we follow a well-written program to keep our teeth healthy. The present book toAccompanied by two dear colleagues in the orthodontic department of Shiraz Dental School, it has been translated. It is a great honor for me that this cooperation has been achieved together with Dr. Hamid Reza Pakshiro and Dr. Parisa Salehi. From God Almighty, I wish them health and well-being.