The influence of the soft tissues in craniofacial growth is very important for the orthodontic diagnosis and the treatment plan. There is influence of airway obstruction on the developmental pattern of the face. Variations in pharyngeal airway space have been described with some sleep disorders such as Obstructive Sleep Apnoea (OSA). This book ,therefore, gives an insight into cephalometric airway analysis,influence of various dental treatment modalities on airway, obstructive sleep apnea, its diagnosis and management.