Normally, in the function of the smile, the lips are re­tracted and elevated to expose a portion of the upper incisor teeth. In some cases, the lip retraction is too ex­treme and it exposes all of the incisors plus a large por­tion of gum above. This produces the so­called horse smile or gummy smile (Fig. 73.1), the correction of which was described by Rubinstein and Kostianovsky [1]. The operation is a relatively simple one that can be performed on an outpatient basis or in a well­equipped office. The results obtained are good.