Kylie Jenner Makes Admission on Famous Lips

The "Keeping Up With the Kardashians" star admits to having lip fillers.
4:36 | 05/07/15

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Transcript for Kylie Jenner Makes Admission on Famous Lips
We're going the take on the "Gma heat index." The hot button topic Oh, got it on time this time. A conversation about her famous lips. Turns out the pout is not natural after all. Not ever going to deny or confirm anything. Reporter: After all the lip service about how kylie Jenner's mouth went there this to this in just a mt.er of weeks, the 17-year-old no longer buttoning her lip, finally admitting in an upcoming "Keeping up with the kardashians" that she used more than lip liner. We asked readers what they wanted to know. They said she has the most amazing lips. Tell us her secret. I have temporary lip fillers. It's an insecurity of mine. It's what I wanted to do. I'm just not ready to talk to reporters about my lips yet. Because -- everyone always picks us apart. Reporter: And sister Chloe confirms what many suspected. She decided to plump her lips. I don't think there's anything wrong with that. I think if you've done something, though, it is right to cop up to it. If you avoid a question, you're going to look like a liar. Reporter: Problem is, in the past, kylie, the youngest in the clan has denied it. Tweeting these plastic surgery rumors hurt my feelings. Her lips inspired a dangerous plumping trend online. Teens putting their lips in small glass containers and sucking the air in to get this swollen look. Kylie Jenner lips challenge. Reporter: It can cause a number of issues, like swelling, bruising, scarring. Kylie's in a change predicament. If she changes something, thousands of fans want to do the same thing. That's a dangerous responsibility to have. Reporter: Kylie coming clean saying she didn't lie about it. She just evaded the question. For dpam "Gma," linsey Davis, ABC news, New York. We're joined by Dr. Whitney Bowe. I came home last Friday night. Four girls around the kitchen table trying out that sucking thing. We have not done a good enough job. It is dangerous. It is. Can cause serious problems in the short term and the long term. Short term, swelling, bruising. Long term, kit lead to serious tissue damage as well. Imagine this marshmallow. This represents your healthy lip. Take the marshmallow, stick it in the Reich row wave, expose to it trauma, it will expand way beyond the size it should be. When it collapses down, it never fully regains its former shape. That's very similar to what is happening to that fragile tissue of the lips. The swelling is what you're hoping to get. Exaggerated swelling, the delicate fiber, they're stretching. And snapping and rupturing. Major problems. Is there that's very effective. To be able to see it. It is. Kylie says, temporary fillers. How is that different from permanent ones? You're thinking about silicon in permanent wans. We're phasing those out. We're using other thing with hyalluronic acid. It hydrates the lips from beneath the surface. It lasts about six months. Do you like -- I mean, I don't -- I'm sure you don't. Talk us to about young people and doing this and the dangers of it and the cautionary tale? From a medical standpoint. It's relatively safe if performed by a board-certified plastic surgeon. A 17-year-old looking to commit to this throughout her lifetime, she could spend close to $100,000 just maintaining the shape of her lips. I'm a mother. I have to look at this from an emotional standpoint as well. Teens are learning how to embrace their individuality. If a teen approaches, I say, hey, let's try alternatives first. Cinnamon oil. Menthol. Those ingredients irritate the lips and create a little, subtle -- It's safe. I think the parents would be grateful that they tried that first, right? You're right. There are many components to this. Thank you very much. Appreciate it.

This transcript has been automatically generated and may not be 100% accurate.

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