Pictures of any pleasant smile would show that the teeth do not extend right to the corners of the mouth
but actually stop some distance from them. Thus there is an area of neutrality or darkness between the teeth and
the corner of the smiling mouth. Between these two neutral spaces lies the anterior aesthetic segment. The neutral
space lies between the dental arch and corner of the smiling mouth. It is a dynamic space which appears in a broad
smile, constantly changing with different expressions. It can be defined as a bilateral space bounded laterally
by the corner of the smiling mouth and medially by the arch. In the aesthetically pleasing smile the spaces between
the corner of the mouth and the dental arch form a backdrop in which the anterior aesthetic segment is featured.
The anterior aesthetic segment is in the Golden Proportion to the width as illustrated in the following paragraphs.
Notice that in the photograph of the grid in the mouth, the edge of the grid lines up with the corner of the smile. This is another compound Golden Proportion showing that the width of ALL the 8 front teeth together are in the Golden Proportion to the width of the smiling lips. The anterior aesthetic segment, from 1st premolar to 1st premolar, is highlighted against the backdrop of the smiling lips, with two neutral parts laterally between lips and teeth. The white of the 8 front teeth is in the Golden Proportion to the width of the smile.
