Studies suggest that the ratio between mouth width and nose width plays a significant role in determining a person’s perceived attractiveness. Specifically, research such as the study titled “Differences in horizontal, neoclassical facial canons in Chinese (Han) and North American Caucasian populations” has shed light on the ideal mouth-to-nose ratio.
According to this study, it is generally considered more attractive for the mouth width to be approximately 1.5 times larger than the nose width. In other words, if the mouth is of a similar size or smaller than the nose, it may not be perceived as attractive. These findings provide valuable insights into the importance of the mouth-to-nose ratio when evaluating facial attractiveness.
Differences in horizontal, neoclassical facial canons in Chinese (Han) and North American Caucasian populations. W Dawei, Q Guozheng, Z Mingli, LG Farkas – Aesthetic Plastic Surgery, 1997 – Springer