The increasing demand for complex rehabilitative dental treatments in the adult patient and in developmental age raises the need for multidisciplinary therapies. The book is intended to trace the orthodontic-periodontal relationships, analyzing how orthodontic procedures can enhance the periodontal treatment plan, increasing its predictability, integrating it, interacting in the surgical approach and, at the same time, how Periodontology increases the potential and predictability of orthodontic treatments, synergically completing them.