Introduction: Smile analisis in dentistry is essential when performin dental aesthetic treatments. The pur-pose of this study is to evaluate the perception of different aesthetic parameters of the smile among den-tists, dental students and patients. Materials and methods: Dentists, dental students and patients evaluated 5 sets of smile pictures through qualified surveys. The photographs were grouped according to modifications made in 3 smile aesthetic parameters: gingival contour, lip line (subdivided into A and B), and dental proportion (further subdivided in width and length). Data was statistically analyzed using Chi-square test. Results: 80% of dentists and students considered more attractive a symmetrical gingival contour, 73% of patients consider more attractive a gingival contour discrepancy up to 1 mm. Regarding Lip Line A, both Dentists (67%) and students (77%) found more attractive a smile with 2 mm of gingival exposure, 67% of patients prefered 1 mm of gingival exposure. Lip Line B, with 1 mm of gingival exposure, was considered more attractive by all respondents. The dental proportion between the width of the central and lateral incisors considered more attractive was 71%; for the width / length of the central incisors, a proportion of 75% was more attractive for the all the groups surveyed. Discussion: Gingival contour was the most sensitive parameter when evaluating the aesthetics of the smi-le. No significant diffrences in perception were found for the other two parameters included in this study.