Classification of smile line
The smile lines can be analyzed according to the following classification –
Class 1 . Very high smile line -more than 2 mm of the marginal gingiva visible or more than 2 rnm apical to the cemento-enamel junction visible for the reduced but healthy periodontium. This could be gimmry smile.
Class2 . High smile line – between 0 and 2 rnm of marginal gingiva visible or between 0 and 2 mm apical to the cemento-enamel junction visible for the reduced but healthy periodontium.
Class3 . Average smile line- only gingival embrasures visible.
Class4 . Low smile line- gingival embrasures and cemento-enamel junction not visible
