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Growth and development of maxillofacial morphology and oral function are closely interrelated. Oral function is comprised of articulation, swallowing and chewing. This oral function when becomes abnormal such as mouth breathing, tongue thrust, swallowing, and unilateral chewing causes malocclusion and by abnormal postures of oral circumferential muscles such as forward tongue thrust, tongue biting and low tongue at rest. Forces from unintentional and habitual behaviours constantly acting on the maxillofacial and alveolar regions can cause the bony structures to generally deform, resulting in jaw deformity and malocclusion. Oral habits may be a part of normal development, a symptom with a deep rooted psychological basis or may be the result of abnormal facial growth. This Book includes a complete and comprehensive understanding of dental and emotional implications of a habit, its various manifestations and successful management.