What are nasolabial folds: the crease every face has

The nasolabial fold — what most people call a smile line or laugh line — is the line that runs from the side of the nose down to the corner of the mouth. It does not appear with age. It has always been there, in everyone, babies included. It is the border between two areas of the face that behave differently: above it, the cheek, which moves little; below it, the mouth area, which moves all the time.

That border exists because the muscles of expression anchor there, into the skin. Every time you smile, the cheek rises and the fold closes. That is why it is also called the smile line.

What changes over time is not whether the fold exists. It is how deep it is at rest — when you are not smiling, not talking, not doing anything.

What gives someone nasolabial folds

Two different things add up, and confusing them is the most common mistake people make when looking for treatment.

The anchoring. The fold is structural. No face is smooth in this area, and none will be. People with more prominent cheekbones or fuller cheeks naturally have a more defined fold from a young age — in those cases, the nasolabial fold is not a sign of aging at all, it is the shape of the face.

The sliding. Over time, the cheek fat compartment loses volume and descends. The bone underneath resorbs as well. Tissue that used to be supported above the fold starts to pile up on top of it, like heavy fabric that slips and creases where it meets a fixed point. The fold, which was only a line, becomes a step: it has a high side and a low side.

Add to that the factors that speed up the loss of collagen and elastin — accumulated sun, smoking, large swings in weight, genetics. And the repetition of expression, which etches in where a fold already existed.

Why it suddenly appeared

It is almost never sudden. What usually happens is an event that reveals what had been happening slowly:

• Rapid weight loss. Cheek fat is among the first to go, and it goes before the skin can keep up. It is the most frequent reason behind "I lost weight and my face aged".
• A stretch of poor sleep or high stress. Fluid retention and worse skin quality leave the area looser for a few weeks.
• A photo lit from above. Overhead light casts a shadow in the fold. The same person, in the same week, under frontal light, sees nothing. A good share of nasolabial fold scares come from lighting, not from the face.
• Always sleeping on the same side. This tends to leave one side more marked than the other — and it is the asymmetry that draws attention, not the depth.

If the change really was abrupt, over days, and came with other signs, it warrants a medical workup before any aesthetic conversation.

At what age nasolabial folds tend to show

There is no age. There is structure. Some people in their early twenties have a well-defined fold inherited with the shape of their face, and some people in their fifties have a shallow one because they have good bone projection and thick skin.

What changes more predictably with each decade is the character of the fold: earlier on it is a line; later it becomes a step, with tissue resting on top of it. Once it becomes a step, surface treatment stops working, because the problem has become one of support.

How to make nasolabial folds go away

They don't go away. If they did, the face would lose the division that gives it dimension — and a face with no nasolabial fold at all does not look young, it looks inflated. That is exactly the result people spot from across the room and call a "done" face.

What can be done is reducing the depth at rest and softening the shadow. The real options:

The order matters more than the choice. Treating the fold without treating what created it is the classic nasolabial fold mistake, and it produces that heavy result, with the crease filled and the cheek above it still hollow.

Why we look at the whole face before touching the fold

Here, assessment never starts with the complaint. The complaint is where the person sees the problem; it is rarely where the problem is.

With nasolabial folds this is almost a rule. A large share of the people who come in asking for fold filler actually need support in the cheekbone area and the midface — and once that support returns, the fold improves on its own, with less product and without the risk of overloading an area that already has too much tissue on top.

The opposite happens too: people who ask for a lot of product in the fold because they want to "get rid of" it. Filling the crease until it is level with the cheek does not make a face young. It makes the lower face wide and removes the transition that light uses to draw the contour. That is something we decline, and we explain why during the assessment.

Natural-looking here is a criterion, not a slogan. The procedure is measured by what it preserves — the smile still lifting the same way, the expression still being yours — not by how much the fold shrank in the photo.

Safety

The nasolabial fold sits over a significant vascular pathway, and the angular artery runs through it with wide anatomical variation from person to person. It is one of the areas where vascular complications from filler are most frequently reported in the literature.

That is why Doppler ultrasound assessment is part of the procedure here: before, to map the anatomy of that specific face and identify material from previous treatments, which changes the injection plan; after, to confirm there is no compression of a vessel.

This is not marketing polish. It is the difference between injecting knowing where the vessel is in that face and injecting by the average of faces.

What doesn't work

• "Filler" creams and serums. They improve hydration, texture and how the skin reflects light — and that genuinely makes the area look better. They do not restore volume or reposition tissue. No cosmetic penetrates the skin far enough to change structure; if it did, it would be an injectable and registered as a drug.
• Facial exercises. The muscles in this area pull on the skin exactly where the fold anchors. Strengthening repeated contraction there, at best, changes nothing.
• Massage, cupping, rollers. A drainage effect that lasts hours.
• Losing more weight. Weight loss tends to deepen nasolabial folds, not reduce them.
• Botox in the fold. Toxin relaxes muscle. Relaxing the lip-lifting muscles in this area harms the smile before it improves the fold. It is not the place for it.

How to downplay them day to day

With no procedure at all, three things change how the area reads:

• Light. Avoid overhead lighting in photos. Frontal, diffuse light erases the shadow of the fold almost completely.
• Makeup. Concealer one shade lighter inside the crease, in a minimal amount and well blended, breaks up the shadow. Heavy or shimmery product does the opposite: it settles into the fold and marks it more.
• Sun protection. It is the only at-home habit with a real cumulative effect on how quickly the area gets worse.

When we advise against it

• When the request is to erase the fold completely. The goal is to reduce depth and shadow. Flattening the fold to nothing changes the character of the face and is the result that gives the procedure away.
• When the cause is advanced laxity. Filling the fold in a face with a lot of tissue resting on it adds weight to an area already overloaded. There, the path is surgical, and we refer to a partner surgeon — said at the assessment, not after three sessions.
• When the complaint is the fold but the structure calls for the midface. Doing what was asked instead of what solves it is the fastest way to spend product without improving the face.
• Before knowing what is already there, when there has been previous filler of unknown origin.
• Pregnancy and breastfeeding. An elective procedure waits.

Frequently asked questions

What causes nasolabial folds?

The fold itself is anatomical and exists in every face — it is where the muscles of expression attach to the skin. What deepens it over time is the loss of volume and bone support in the cheek, combined with laxity and repeated expression. Face shape and genetics determine how defined it already was when young.

Can nasolabial folds be cured?

No, because they are not a disease — they are structure. What exists is management: softening the depth, treating the cause of the lost support, and maintaining. They deepen again as the process continues.

How long does treatment last?

It depends on the product, the technique, the area and each person's metabolism — and that variation is wide enough that any number promised up front is a guess. It gets defined at the assessment, based on what was actually used in your case. There is an article dedicated just to that.

How much does nasolabial fold filler cost?

We don't publish prices. What makes up the cost is the amount and type of product indicated for that face, the complexity of the area and the procedure time — and none of that exists until after the assessment. A fixed price before anyone looks at your face means a ready-made plan before a diagnosis.

Is there something Koreans do differently?

What shows up in that reference is a preventive, early approach, focused on skin quality and support — not on correcting the fold after it has formed. Combined with daily sun protection kept up for decades. It is consistency, not a secret technique. Thread lifts also come up a lot in that context; RUV does not work with threads.

Do men have deeper nasolabial folds?

Male skin is thicker and bone structure usually provides more support, which delays the step. When it does show, it tends to be deeper and to read as a sharply defined line. Treatment follows the same logic, with extra care not to round out the midface.

Is it normal to have a nasolabial fold on only one side?

It is common, and it almost always comes from the face's natural asymmetry combined with a habit of sleeping on the same side. Slight asymmetry is a feature of a real face. Asymmetry that appeared recently and quickly deserves an assessment.