Four factors of aesthetic composition can be simply and effectively applied to the smile.They help the clinician decide adequate tooth display,tooth size,tooth arrangement,and direction to the face during aesthetic disgnosis and during treatment.They are:

    1,Proportion and idealism:the relation of one part to another or to the whole with respect to size,quantity,or degree;a standard of perfection,beauty,or excellence.

    2,Symmetry:the correspondence in size,shape,and relative position of parts on opposite side of a dividing line or median plane or around a center or axis.

    3,Perspective and illusion:the technique or process of representing on a plane or curved surface the spatial relation of objects as they might appear to the eye.

    4,Frame and reference:the constructional system that gives shape;a standard for measuring or constructing.

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