“…The current esthetic requirements have led to a scientific deepening of the topic, recognizing three fundamental units of the perioral district: lips, teeth, and periodontal tissues (Bhuvaneswaran, 2010 ; Garber & Salama, 1996 ). These units are connected through lines of symmetry, proportions, and colors (Bukhary et al, 2007 ; Calamia & Wolff, 2015 ; David et al, 2015 ; Manipal et al, 2014 ). In this articulated balance, the anatomy of the gingival margins is crucial (Giancotti et al, 2011 ; Spear et al, 2006 ).…”