Quick answer: For nasolabial folds, a thread lift lifts the dropped mid-cheek straight away, which softens the fold from above. Ultherapy tightens the deep SMAS layer gradually and gives a milder lift with no needles. Threads suit deeper folds caused by cheek sagging; Ultherapy suits early folds and maintenance. Very deep folds may also need filler.
Key takeaways
- Nasolabial folds run from the side of the nose to the corner of the mouth.
- They often deepen because the cheek drops and loses volume.
- Threads lift the cheek right away; Ultherapy lifts gradually.
- Ultherapy has less downtime; threads give a stronger change.
- Filler can soften the fold itself when it is very deep.
Why do nasolabial folds deepen?
Everyone has nasolabial folds, often called smile lines. They become deeper when the mid-cheek fat pad moves down and loses volume, when the skin and SMAS loosen, and when the bone under the cheek slowly changes with age. Weight loss and sun damage can make them more visible. Treating the cheek above the fold often helps more than treating the fold alone.
How does a thread lift help?
A thread lift uses dissolvable PDO or PLLA threads placed under the skin of the mid-face after numbing. Barbs or cones hold the dropped cheek tissue and lift it up and back. This reduces the weight sitting on the fold, so it looks softer right away. Collagen forms around the threads as they dissolve, and results often last about one to two years.
How does Ultherapy help?
Ultherapy is a micro-focused ultrasound treatment by Merz Aesthetics. With live imaging, the doctor places small heat points in the SMAS and deep dermis of the cheeks and lower face. Over two to three months, collagen builds and the tissue tightens, giving a gentle lift that can soften early folds. There are no needles, and results usually last about a year.
How do thread lifts and Ultherapy compare for smile lines?
- Method: threads physically lift tissue; Ultherapy tightens with ultrasound.
- When results show: threads right away; Ultherapy over two to three months.
- Strength: threads moderate to strong; Ultherapy mild to moderate.
- Downtime: threads one to two weeks of swelling or tightness; Ultherapy a few days of mild tenderness.
- Best for: threads for deeper folds from cheek sagging; Ultherapy for early folds and prevention.
When are threads the better choice?
Threads are often better when the cheek has clearly dropped and the fold looks heavy, especially in people in their 40s and older. Lifting the mid-cheek can make a noticeable difference to the fold and also brighten the whole face. Many people like that the change is visible straight away.
When is Ultherapy the better choice?
Ultherapy is often better for people in their 30s or early 40s with mild folds, good skin and little sagging. It is also useful for maintaining results after threads. If you prefer no needles and minimal downtime, it is a comfortable option.
Where does filler fit in?
When a fold is very deep or the cheek has lost a lot of volume, lifting alone may not be enough. A small amount of filler in the cheek or directly in the fold can restore support. Doctors usually prefer to lift first and add only the filler that is needed, to avoid a heavy look.
Can you combine the treatments?
Yes. A common plan in Korea uses threads for the immediate lift, Ultherapy for deep tightening and a little filler for volume. The combination depends on your face and on how much time you have in Seoul.
Is it safe?
Both are safe in experienced hands. Thread risks include bruising, swelling, asymmetry and visible threads. Ultherapy risks are rare and include small burns or temporary numbness. Choose a doctor who knows mid-face anatomy well and uses genuine products.
How to decide
Korea treated about 2.01 million foreign patients in 2025, and around 63% came for dermatology, according to the Ministry of Health and Welfare. Smile lines are one of the most common concerns among visitors. The right plan depends on whether your fold comes from sagging, volume loss or both.
Frequently asked questions
Can threads remove nasolabial folds completely?
No treatment removes them completely, but threads can soften them clearly.
Is Ultherapy enough for deep smile lines?
Usually not alone. Deep folds often need threads, filler or both.
How long do results last?
Threads often last one to two years; Ultherapy usually about a year.
Is there downtime with threads?
Expect swelling and tightness for about one to two weeks.
Sources
- Ministry of Health and Welfare, Republic of Korea – 2025 foreign patient statistics (press release, 2026).
- U.S. Food and Drug Administration – 510(k) premarket notification database (Ulthera System).
- Ministry of Food and Drug Safety, Republic of Korea – medical device approval information (absorbable lifting threads).
This article is for general information only and is not medical advice. Results vary between individuals. Please consult a qualified physician before any treatment.
