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SMILE AESTHETICS APPRECIATED BY LAYPERSONS The objective of another study was to evaluate the role of the posed smile in overall facial esthetics, as determined by laypersons and orthodontists. The presence of a malocclusion has a negative impact on facial attractiveness. Orthodontic correction of a malocclusion affects overall facial esthetics positively. Laypeople and orthodontists agree on what is attractive (7). Other study shows that the orthodontically treated subjects had significantly poorer smile scores than the subjects with “normal occlusion. The height of the upper lip to the upper central incisor influenced the rating of the smile, the most attractive smiles having the upper lip at the height of the gingival margin of the upper central incisor (8). Some authors also try to evaluate the aesthetic smile by determinating whether asymmetric and symmetric anterior dental discrepancies are detectable by dental professionals and laypersons. Orthodontists were more critical than dentists and laypeople when evaluating asymmetric crown length discrepancies. A small midline diastema was not rated as unattractive by any group. Unilateral reduction of papillary height was generally rated less attractive than bilateral alteration Asymmetric alterations make teeth more unattractive to not only dental professionals but also the lay public (9). Other study evaluated the hard- and soft-tissue contributions to the esthetics of the posed smile in growing patients seeking orthodontic treatment. Vertical lip thickness proved to be the most influential variable in smile aesthetics. The significant relationship of incisor protrusion with the vertical thickness of the vermilion border of the upper lip must be considered when planning orthodontic treatment (10). Conclusion This study helps us to establish a set of dynamic norms for the aesthetics of smile components. Thus, the parallelism of smile arch with the upper lip smile, horizontal linear smile, an anterior and posterior medium smile height, the last visible tooth during smile actions has to be the second premolar and a medium buccal corridor are the most aesthetic variants. The most unsightly variants have been rated the follows: a reverse smile arch of a hollow smile, a concave smile, an anterior and posterior height smile, the last visible tooth during smile actions is the first molar and a smile with a wide buccal corridor. For the success of orthodontic treatment , both in terms of aesthetic, functional and occlusal is very important for the orthodontist to know all the details about the ideal aesthetic norms of smile (1). In this paper we wanted to emphasize the importance of aesthetic norms of smile for orthodontic treatment and summarize, if possible the aesthetic smile canons of our time. Bibliography 1. Zetu I, Pacurar M. Ortodontie. Tehnica arcului drept. Analize necesare, Vol. I,Tg. Mures: Editura Lyra; 2003. 2. McLeod C, Fields HW, Hechter F, Wiltshire W, Rody W Jr, Christensen J. Esthetics and smile characteristics evaluated by laypersons. Angle Orthod. 2011;81(2):198-205. 3. Hassebrauck M. The visual process method: A new method to study physical attractiveness. Evol Hum Behav 1998;19(2):111-123. 4. Ackerman JL, Ackerman MB, Brensinger CM, Landis JR. A morphometric analysis of the posed smile. Clin Orthod Res 1998;1(1):2-11. 5. Ackerman MB, Ackerman JL. Smile analysis and design in the digital era. J Clin Orthod. 2002;36(4):221-236. STOMA.EDUJ (2015) 2 (1) 6. Maulik C, Nanda R. Dynamic smile analysis in young adults. Am J Orthod Dentofacial Orthop. 2007;132(3):3