Excessive gingival display, or what is known as Gummy Smile, is a clinical condition which is attracting a great attention and focus recently. Having knowledge and background about the cause and the treatment of each case of excessive gingival display is essential for making the accurate diagnosis and performing the correct procedure. This article reviews the most common causes of excessive gingival display, manifestations of this condition, and some of the important treatment options for Gummy Smile. In addition, the article also puts the light on some points regarding the accepted measurement in several studies, and considers the prediction planning for Gummy Smile associated with a skeletal etiology.