Our lips provide competence to the oral cavity when we chew our food. They may also affect sounds and facilitate facial expression which help us communicate what we feel. Lips also have their own aesthetic value.

Earlier this year, the Kylie Jenner Lip Challenge went viral on the internet. People who took the challenge sucked the air out of a glass to create fuller lips that is said to be more attractive. Of course, everything did not go well for others because many attempts ended in painful bruisings and trips to hospitals.

Sucking glass cyclinders did not make Kylie's lips look plump - it was cosmetic enhancement that did it. In an interview with Cosmopolitan magazine, she admitted using a filler and advised others who want a similar look to try a filler that lasts about two to four months, in case they change their mind and want to give it up.

For dermatologists and Medspa owners who work with patients desiring for plump lips, giving advice to patients during patient consultation may boost patient satisfaction rate.

A study in Germany was conducted "to clarify what it is that makes lips attractive - and whether there are gender-related differences of an attractive lip and lower third of the face".

After patients' lip and chin regions were photographed and evaluated by voluntary judges through a Likert scaling system, the results showed that there were certain parameters of the lips that add attractivity of both male and female individuals. Further, gender-related differences were manifested in the form and shape of an attractive lower third of the face.

• There is a significant higher ratio of upper vermillion height/mouth-nose distance in frontal-view images of attractive compared to unattractive female (p < 0.001) and male (p < 0.05) perioral regions.
• Furthermore, the ratio of upper vermillion height/chin-nose distance was significantly higher in attractive than in unattractive female (p < 0.005) and male (p < 0.05) lip and chin regions.
• The nasolabial angle was significantly sharper in attractive compared to unattractive female perioral regions (p < 0.001).
• Attractive female lip and chin regions showed a wider mentolabial angle compared to unattractive female lip and chin regions (p < 0.05).
•  Comparing men and women, we found that attractive female perioral regions showed a higher ratio of lower vermillion height/chin-mouth distance (p < 0.05) and lower vermillion height/chin-nose distance than attractive male perioral regions (p < 0.05).

Read more on: http://www.jprasurg.com/article/S1748-6815(15)00137-0/abstract