Described as being either thin and scalloped, or thick and flatter in contour. The contour of the gingiva depends on the contour of the cementoenamel junction of the teeth, the amount of embrasure space, and the nature of the contact between teeth. The gingiva appears prominent over the tooth root and may have a slightly concave appearance in the interproximal area.
Serio F.G, Hawley C.E, Manual of Clinical Periodontics A.Tujios
Prior to a smile analysis, a thorough exam, including appropriate radiographs, should be completed to ensure that more pressing concerns such as decay and infection are not present. Depending upon the results of your smile analysis, you may wish to take impressions of the teeth to create study models. These models can be used to help plan treatment and create a diagnostic wax-up of possible treatment results.
Only with a thorough background in the rules of esthetics can a detailed evaluation of what the patient desires be achieved. This is critical because the patient may be unable to accurately describe their own desire. Of course, take pre-op photographs, formulate a treatment plan and prepare to moderate the patient’s expectations.
Ref: CR Rufenacht. Fundamentals of Esthetics . Quintessence. 1990. p.67-132.