“…Previous studies have shown that there was a significant difference in the perceptions of smile attractiveness between laypersons and specialists, males and females, and among laypersons of different ages. 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 This information can help dentists understand how different subjects evaluate their smile. Once the treatment plan meets a subject's desires, dental treatment can be proceed smoothly.…”