In this book the reader will fin d answers about the clinical management of orthodontic-periodontal relationships, analyzing how orthodontic procedures can enhance and integrate the periodontal treatment plan, increase its predictability, and interact with the surgical approach and, at the same time, how perdiodontology increases the potential and predictability of orthodontic treatments, completing them synergically. The authrors discuss the ortho-perio timing issue, a topic which has been long debated, but never completely standardized. The various phases and sequences in orthodontic, periodontal and surgical treatment are explained with their reciprocal connections through a step-by-step flow. An ortho-perio risk assessment has been developed and described to early identify and determine which risk factors exist ; the readers will learn to recognize them and to apply a diagnostic screening protocol not only in the full-blown ortho-perio patient, but also in the initially apparently pure orthodontic growing patient. Clinical cases show the phases of orthodontic and surgical mechanics by analyzing how orthodontics makes the conventional regenerative periodontal and implant surgical procedures more predictable. The authors' standardized orthodontic and surgical techniques, the ortho-perio treatments and biomechanics are described with the help of clinical cases in vestibular and lingual orthodontic techniques and supported by the recent international literature.