Introduction: Resting tooth-lip relationship virtually leads the clinician to analyse photographs of the smiles and test the reproducibility and reliability of posed smile. Aim of the study is to assess smile aesthetics using ‘variables of smile’ among pre and post orthodontic subjects and implicating it to the orthodontic treatment planning. Methodology: Pre and post-treatment smile photographs (50 subjects) were taken with DSLR Camera (Canon 700D) in NHP and assessed using AutoCAD version 2007. The variables considered in study are Buccal Corridor Space, Smile Arc, Occlusal Cant, Smile Symmetry, Maxillary Midline to Mandibular Midline. Results: Paired t-test was performed showing highly significant differences in buccal corridor space which is 0.000 with p < 0.05 and rest of the smile variables showing 100% positive changes after the treatment in all the compared groups. Conclusion: a) buccal corridor space, b) smile arc and have a distinct characteristic change which made a maximum impact on aesthetic visualization between all the groups. Maxillary and mandibular midlines, occlusal cant are the parameters which show significant changes hence compulsorily should be used in pre-orthodontic evaluation. Parameters like, smile symmetry is subject to ethnic and social variations hence objective assessment has limitations.
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