The Distribution of Gingival Display and Possible Related Factors Resulting in Gummy Smile

"All individuals were instructed to sit on a dental chair and the measurements were made by using a millimetric ruler. Next, the patients were grouped according to Liebart's classification by gingival display at maximum smile as follows:~Class 1.Excessive gingival display (Gummy smile): ≥ 3mm gingival display Class 2.High smile line: 0-2 mm of gingival display Class 3. Average smile line: Dental papilla is visible. Class 4. Low smile line: Gingival margin, dental papilla is not visible at all."