This is to be achieved complementing the patient’s facial structure. Smile designing is the process of planning and designing the patient’s desired smile.
The components of a well smile have been described by various authors, the most prominent being Sabri’s Eight Components of a balanced smile. The components were lip line, smile arc, upper lip curvature, lateral negative space, smile symmetry, frontal occlusal plane, dental components and gingival components. They concluded that an optimal smile is characterized by an upper lip that reaches the gingival margins, with an upward or straight curvature between the philtrum and commissures; an upper incisal line coincident with the border of the lower lip; minimal or no lateral negative space; a commissural line and occlusal frontal plane parallel to the pupillary line and harmoniously integrated dental and gingival components.
There are multiple factors that determine these components ,the anatomy and physiology of the facial structures, that is the skin ,musculature and relationship with the other parts of the face.