Quick answer: Nasolabial folds are the smile lines from the nose to the mouth corners. The best treatment depends on the cause. Filler softens a deep fold quickly. Lifting with HIFU, RF or threads helps when the fold comes from cheek sagging. Collagen stimulators and skin boosters improve skin quality. Many people get the best result from a combination.
Key takeaways
- Nasolabial folds are normal, but they deepen with volume loss and sagging.
- Filler gives the fastest result but is not always the best first choice.
- Lifting the cheeks often softens the fold more naturally.
- Collagen stimulators improve skin firmness over months.
- Most options have short downtime, suitable for a trip to Seoul.
What causes nasolabial folds?
- Cheek volume loss: the mid-face flattens with age.
- Sagging: cheek tissue moves down and folds over the line.
- Skin quality: less collagen makes the line more visible.
- Facial expression: smiling and talking deepen the crease over time.
Treating only the line can look unnatural if the real cause is sagging. Smile line treatments are among the most common requests from visitors. Korea treated about 2.01 million foreign patients in 2025, and around 63% came for dermatology, according to the Ministry of Health and Welfare.
Which treatments work best for nasolabial folds?
1. Dermal filler
HA filler softens the fold straight away. A good doctor may also add a little filler to the cheeks for support, rather than filling only the line. Results usually last 9 to 12 months or more. See dermal fillers in Seoul.
2. HIFU lifting
Focused ultrasound lifts deeper tissue, which reduces the weight on the fold. Good for mild to moderate sagging. See our Ultherapy Prime guide and HIFU lifting.
3. Radiofrequency tightening
RF devices such as Thermage FLX heat the skin to tighten it and support collagen.
4. Thread lift
Threads lift the cheeks directly, which can soften the fold quickly. See the Korean thread lift guide.
5. Collagen stimulators and skin boosters
Products such as Juvelook and skin boosters improve skin thickness and texture around the fold. See our Juvelook guide and Rejuran Healer guide.
Which option is right for me?
- Deep fold, good skin, little sagging: filler.
- Fold caused by cheek sagging: HIFU, RF or threads, sometimes with a little filler.
- Fine lines and thin skin around the fold: collagen stimulators or boosters.
- Early prevention in your 30s: regular lifting and skin quality care. See anti-aging treatments in your 30s.
What is the downtime?
- Filler: mild swelling or bruising for one to three days.
- HIFU: mild redness or tenderness for a few days.
- Threads: swelling for about a week.
- Boosters: small bumps for one to two days.
See low-downtime treatments before flying to plan around your trip.
How to get a natural result
- Do not overfill the line. A completely flat fold can look unnatural when you smile.
- Treat the cause, such as cheek volume or sagging, not only the line.
- Start with a conservative amount and review after two weeks.
Read how to get natural-looking Botox and fillers for more tips.
Is it safe?
These are common treatments with mostly mild, short side effects. The nasolabial area has important blood vessels, so filler must be placed by an experienced doctor. Contact the clinic right away if you notice severe pain or skin colour changes after filler.
How to choose a clinic for smile line treatment
- Choose a doctor who looks at your whole face, not only the line.
- Ask which products or devices will be used and get a written quote.
- Make sure the doctor who consults you also performs the treatment.
- Check that you can come back for a review before you fly home.
Our guide to choosing a dermatology clinic in Gangnam explains more.
Frequently asked questions
Can nasolabial folds be removed completely?
They can be softened a lot, but a small natural line is normal and looks better when you smile.
How long does filler for smile lines last?
Usually 9 to 12 months, sometimes longer.
Is lifting better than filler for smile lines?
If sagging is the main cause, lifting often looks more natural. Many people combine both.
What about marionette lines?
They often appear together. See treatments for marionette lines.
Sources
- Ministry of Health and Welfare, Republic of Korea – 2025 foreign patient statistics (press release, 2026). mohw.go.kr
- U.S. Food and Drug Administration – dermal fillers (soft tissue fillers) information. fda.gov
This article is for general information only and is not medical advice. Results vary between individuals. Please consult a qualified physician before any treatment.
