The objectives of this review article are to study the etiology, clinical and radiographic examination, diagnosis and treatment plan for patients who have gummy smile. There are many factors related to gummy smile such as gingival growth, tooth eruption, growth and development of alveolar bone and maxilla, lip morphology and muscle function of lips patients who come for dental treatment should be examined clinically and radiographically to search for the etiology of gummy smile and to achieve proper treatment plan, The treatment of gummy smile includes periodontal treatment orthodontic treatment and maxillofacial surgery, depends on the etiology. To achieve a good treatment result, the cooperation between many specialists is needed. This review article might be useful and can be used as a guide line for treatment and transference of patients who have gummy smile.