It is very important to diagnose the cause of the gingival smile, before the treatment, so that the result of any intervention is final and stable. Causes that lead to a gummy smile: Hyperactive upper lip, which “rises” a lot when we smile Short upper lip, which does not cover the teeth of the upper jaw Covering the teeth of the upper jaw by the gums Incomplete eruption of the teeth of the upper jaw Large growth of the upper jaw Even when the teeth have a normal position and arrangement in the mouth, they may show some irregularities in thickness and especially in height. As a result, some teeth look closer than others. The exact diagnosis for the cause of the problem made by the orthodontist, who will also suggest the appropriate invasive treatment.