K-Smooth™ Instant Line Filler
K-Smooth™ Instant Line Filler
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“My lipstick used to bleed into the little lines above my lip by lunchtime. It stays inside the lines now, with a clean edge, all day long.”
“I was quoted $800 to have my smile lines filled. This took three minutes and nobody at work could tell the difference.”
“The lines around my mouth were the first thing I saw in every photo. Three minutes after I put this on, my smile lines had softened so much my daughter asked what I had done.”
How To Use
- Start on clean, dry skin — no cream or serum underneath, or the filler has nothing to hold on to.
- Roll the tip along the line — the smile line from the nose to the corner of the mouth, the little lines above the lip, the corners of the mouth.
- Tap, never rub. Press it into the groove with your ring finger, in one direction.
- Wait 2 to 3 minutes before anything goes on top. That is when the line fills and sets flat.
- Makeup on top if you want it. Foundation and lipstick glide over it instead of sinking into the lines.
- Like any makeup. Your usual cleanser at night.
- It lifts off in one go — no residue, no build-up.
- Never on broken or irritated skin. Keep it away from the lips themselves and the eyes.
- How often? Every morning, or before any evening where you want the lines gone. While it is on, hyaluronic acid and niacinamide care for the skin underneath.
- When will I see it? Three minutes after the first application. It holds all day, through meals and conversation, until you wash it off.
- How long does a tube last? About two months used every morning on the smile lines and lip lines.
Key Ingredients
Hyaluronic Acid — draws water into the thin skin around the mouth so it looks plumper and softer.
Niacinamide — refines texture and supports the skin barrier.
Vitamin C — brightens the shadow that sits inside a deep smile line.
Glycerin — locks in moisture without a greasy or cakey finish.
Fragrance-free, paraben-free, no retinol, no acids. Dermatologically tested. Suitable for sensitive skin. Full ingredient list printed on the pack.
Shipping & Delivery
Typical delivery: United States 7–12 business days, United Kingdom 6–10, Canada 8–14, Australia 8–14, New Zealand 9–15.
30-Day Guarantee
Loved by 40,000+
Korean makeup artists fill the lines around the mouth before the camera rolls, not after. We put that backstage step in a tube. Roll it into the line, tap, wait three minutes: the groove fills, the skin reads smooth, and it holds all day.
Try it at home30-day money-back guarantee
Smile lines smoothed in 3 minutes
“I have deep smile lines and I had given up on hiding them. Three minutes after rolling this in, they had softened so much my husband asked if I had had filler. My foundation does not sink into them anymore. I am on my third tube.”
Verified customer
Visibly smoother smile lines and lip lines in 3 minutes
The filler look — without the needle, the bruising or the frozen smile
The Real-Life Results
Trusted by over 2 million women in Korea.
It fills the line instead of covering it
A line around the mouth is not on your skin, it is in it: a groove folded in by every smile, every sip, every word, until one day it stops springing back. A cream coats the surface and the groove stays. K-Smooth works like spackle in a crack. Tightening film-formers settle into the line and set flat, so the skin reads smooth, while hyaluronic acid and niacinamide keep it soft underneath.
Smooth all day.
Gone tonight.
Finally. Makeup that sits on the line, not in it.
All day
Lipstick stays inside the lip line, foundation stays on top
One cleanse
Washes off like makeup, no residue
“The lines around the mouth are the ones my patients notice first, and the ones they are most nervous about injecting, because nobody wants a stiff smile. What I like here is that it does not pretend to change the skin overnight: it physically fills the groove at the surface, so the line reads smooth in minutes, and it comes off at night with a cleanser. It is fragrance-free, it does not sting on the thin skin above the lip, and for a patient who is not ready for filler it is an honest first step.”
Dr. Laura Bennett, board-certified dermatologist
04
+50
Why fill the line instead of creaming it?
That's why 40,000+ women switched.
Powered by the K-Smooth™ Complex
1. Tightening Film-Formers
The filler. They settle into the groove of each line and set flat in about three minutes, so the skin reads smooth instead of creased, like spackle in a crack.
2. Hyaluronic Acid
Draws water into the thin skin around the mouth, so it looks plumper and softer underneath the film.
3. Niacinamide
Refines texture and supports the skin barrier, so the area around the lips looks smoother day after day.
4. Vitamin C
Brightens the shadow that sits inside a deep smile line, so the fold looks less marked.
5. Glycerin
Locks in moisture without a greasy finish, so it never feels tight or cakey.
4.8
Based on 6,294 verified reviews
We're here to help
Frequently asked questions
What makes K-Smooth different from an anti-wrinkle cream?
A cream moisturises the surface and stops there, so the line is still there underneath. K-Smooth is a filler, not a cream. Its tightening film-formers settle into the groove of each line and set flat, so the surface reads smooth in about three minutes. Hyaluronic acid and niacinamide look after the skin underneath while it is on. One step, and you can see it in the mirror.
Will it work on deep smile lines?
Yes, with an honest answer on what to expect. The fine lines above the lip and at the corners of the mouth can all but disappear. A deep smile line from the nose to the mouth will look visibly softer and shallower, and far less shadowed, rather than erased. Most women say that is the difference between noticing it in every photo and not noticing it at all.
Can I wear lipstick and foundation on top?
That is what it is made for. Let it set for two to three minutes, then put your makeup on as usual. Foundation glides over the filled line instead of settling into it, and lipstick stops travelling into the little lines above the lip, so the edge stays clean all day.
Is it safe for sensitive skin?
Yes. It is fragrance-free, paraben-free and dermatologically tested, with no retinol and no acids, which is what usually stings on the thin skin around the mouth. If your skin reacts easily, try it on a small area first. Do not apply it on broken or irritated skin, or on the lips themselves.
How long does it last, and how do I take it off?
It holds all day, through meals and conversation, until you take it off. At night, use your usual cleanser: it lifts off in one go with no residue. Put it on again the next morning. It takes three minutes.
Can I use it on other lines?
Yes. It was designed for the lines around the mouth because that is where creams do the least, but it works the same way on the lines between the brows, across the forehead and at the corners of the eyes. Keep it out of the eyes themselves.