Several factors determine the most visually appealing aesthetic zone, or smile line, for you. The aesthetic zone is the teeth that are showing when you smile.
The size and shape of your lips and your lips, your facial muscles and your gum tissue all contribute to your optimal smile line, which reveals as little gum tissue as possible.
For the most aesthetically appealing smile line possible, visible gum tissue should feature balanced, even contours that complement your upper lip.