The smile arc: review and synthesis

ABSTRACT Introduction: The smile arc is an esthetic parameter that has been better investigated by Orthodontics after the “new esthetic paradigm”. Its diagnostic evaluation and inclusion in the objectives of orthodontic planning has become fundamental for professionals seeking for more beautiful and youthful natural esthetic outcomes. Objectives: To review concepts related to the smile arc, analyze the determinants of its appearance, understanding how the possible variations can affect the esthetic perception of smile.