Sisters Birgitta Ás and Yrja Ás put these photos on Facebook. As you can see, the results of plumping up your lips using a plastic bottle are quite frightening. Photo/ Facebook

"It was very, very painful," says eighteen year old Yrja Ás Baldvinsdóttir who tried enlarging her lips with a bottle, Kylie Jenner style. The method, found on the internet is popular amongst young Icelandic women, and involves sucking your lips into an empty bottle until they swell up.

"I just wanted to try it out and see what happened. It's the first time we've done it," explains Baldvinsdóttir who tried out the method with her sister. " I won't be doing it again. My lips turned blue. But after we put our photo on the popular BeautyTips Facebook page we've seen a number of girls copying us. "

Cosmetic surgeoun Þórdiís Kjartansdóttir says to mbl.is that she's never heard of this practice before. "It can definitely be dangerous if you keep doing it, or do it for too long. The lips become blue with blood and swell up and could become infected or lose all sensation. A really dangerous game, " she says and adds that she woulld strongly advise against the method to anyone.