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When the maxillary incisal edges align with the inner contour of the lower lip at full smile, it is considered ideal. This positioning is often described as “consonant”.56 Younger individuals tend to display a more pronounced curvature of the incisal edges and lips during smiling and can straighten with age.57 This association with youth may lead to the perceived desirability of such a relationship for optimal esthetics.57 Orthodontic treatment has also been associated with flatter smile arcs than those found in individuals with untreated dentition and normal occlusions.18 This flattening of the smile arc may inadvertently compromise overall esthetics post-orthodontic therapy.18,28,58
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