The lines that run from the nose to the corners of the mouth are the most misunderstood feature of the aging face. Patients call them smile lines and reach for a filler, assuming the crease is a wrinkle in the skin. It is not. The nasolabial fold is not a line at all — it is a shadow cast by a three-dimensional shift in the tissue above and below it.
As a specialist in facial rejuvenation in Dubai, I want this article to explain that shift: specifically, what makes the fold *deepen*. Not the surgical technique used to correct it, but the anatomy of the fold itself — because for anyone researching this in Dubai, understanding what actually builds the crease is what explains why some treatments smooth it and others barely touch it.
Key takeaways: the fold is an object, not a line
- The nasolabial fold is a contrast between fullness above and hollowing below.
- The descending malar fat pad piles bulk above the fold.
- The fold sits on a fixed compartment boundary anchored into the skin.
- The deep medial compartment deflates, dropping support below.
- Fillers add volume below but cannot release the tether above.
- Naming the dominant force is what separates real correction from filling a shadow.
This anatomy-first way of reading the fold is how I work as a facial aesthetic surgeon in Dubai. My purpose here is not to describe how a facelift is performed, but to explain the structure of the fold — because once you see what casts the shadow, the reason surface treatments have limits becomes obvious.
The fold is a boundary, not a crease in the skin
The single most useful thing to understand about the nasolabial fold is that it marks a border. A CT study of the facial fat compartments, performed on nine cadaver heads after injecting contrast medium directly into the compartments, found that the nasolabial fold represents an anatomical border between adjacent fat compartments, and that this boundary extends into the overlying skin. The fold is where one territory of facial fat ends and another begins.
That single fact explains why the crease behaves the way it does. Because the tissue is tethered along this line, fat cannot simply flow across it. Volume that gathers on one side stacks against a fixed edge rather than blending smoothly past it. The fold, in other words, is a structural boundary that the aging face presses tissue against — not a wrinkle that formed in the skin from folding.
Above the fold: bulk that accumulates
The first of the two forces that deepen the fold acts from above. The superficial malar fat pad — the main volume of the cheek — descends with age, sliding downward and medially from its youthful position over the cheekbone. As it migrates, it piles extra volume directly above the fold.
Because that descending bulk meets the fixed boundary of the fold and cannot cross it, it overhangs the line. The heavier the cheek sits over the crease, the sharper and more shadowed the boundary becomes. This is why the fold so often reads as a stark step-off between a full cheek and a flatter upper lip: the fullness is real, and it is being held above a line it cannot pass.
Below the fold: support that is lost
The second force acts from below. Deeper against the bone, the deep medial fat compartment tends to deflate and atrophy with age. This is a loss of the structural support that once held the skin and muscle below the crease smoothly forward.
As that deep support empties out, the overlying tissue below the fold collapses inward. Now both forces are working together: bulk building above the line and the ground dropping below it. The fold’s depth is precisely the difference in height between those two sides — the fuller it gets above and the more hollow below, the deeper the crease appears.
How descent above, a fixed boundary, and deflation below combine to deepen the nasolabial fold, by Dr. Nazmi Baycin, Dubai.
Why fillers reach a limit on this particular fold
Many patients begin with dermal fillers, and for fine lines and subtle contouring they can be excellent. But the nasolabial fold has a specific anatomy that limits what volume alone can do, and understanding the boundary explains why.
Fillers work by adding volume below the crease to push the fold up from beneath. The difficulty is that the compartment boundary extends into the skin, so the fold is held down by a fixed tether that added volume cannot release. On top of that, if the descended bulk above the fold is left unaddressed, adding volume below can produce a puffy, overfilled look rather than a smooth one. The authors of that CT study concluded exactly this: improvement of the nasolabial fold by compartment-specific volume augmentation is limited by boundaries that extend into the skin.
This is the heart of the matter: a filler treats the shadow, but it does not move the objects casting it — the descended pad above, the tethered boundary, and the deflated compartment below. That distinction between the shadow and the object is the whole reason the fold is so resistant to surface treatment.
- The descended pad above: the malar fat that has slid down over the fold and must be repositioned, not padded around.
- The tethered boundary: the compartment border anchored into the skin, which volume cannot dissolve.
- The deflated compartment below: the lost deep support that genuinely can be rebuilt with volume, in the right plane — the same study notes that deep fat beneath the nasolabial crease can be used for augmentation and elevation of the fold.
What actually deepens versus softens the fold
There is an elegant piece of anatomy that captures why direction matters so much here. An anatomic and histologic study of the nasolabial fold found that traction on the SMAS or periosteum lateral to the fold can actually deepen it, while traction on the more superficial fascial-fatty layer lessens it. The direction and depth at which tissue is repositioned determines whether the fold eases or worsens.
This is why simply pulling skin tight tends to flatten the fold unnaturally rather than resolve it, and it is the anatomical reason genuine correction has to work at the level of the descended and deflated structures rather than the surface. The mechanics of releasing and repositioning those layers is a surgical subject in its own right, which I cover in my article on the anatomy behind the deep plane facelift. Here, the point is simply that the fold responds to structure, not to surface tension.
Reading which force dominates
Because the fold is built by more than one force, the first task in any assessment is to read which one dominates in a given face. The balance is different for everyone, and that balance is what should determine the approach.
| Dominant force | What the fold looks like | Why it happens | Why surface filling falls short |
|---|---|---|---|
| Descended bulk above | A heavy cheek overhanging a sharp line | The malar fat pad has slid down and medially | Adding volume below only deepens the overhang |
| Deflation below | A hollow, shadowed trough beneath the crease | The deep medial compartment has atrophied | Volume helps but cannot release the tether |
| The fixed boundary | A crisp line that resists smoothing | The compartment border is anchored into skin | No amount of filler dissolves a tether |
| Combined (most faces) | Fullness above and hollowing below at once | All three act together over time | A single-layer fix under-corrects |
Reading the table, the pattern is clear: the fold is rarely one thing, so an honest plan begins by naming the dominant contributor rather than defaulting to filling the visible line. Where the question becomes which surgical approach best restores those structures, and how different techniques compare in durability, I discuss that separately in my comparison of deep-plane versus SMAS facelift techniques.
From understanding to correction
Understanding what builds the fold changes the entire conversation about correcting it. Instead of asking how to fill the line, the question becomes how to reposition the descended pad above, respect the tethered boundary, and rebuild the deflated support below — a structural restoration rather than a surface disguise.
That structural approach is what a comprehensive facial procedure is designed to achieve, and you can read more about the anatomical philosophy behind it on my page for facelift surgery in Dubai. But the foundation of any good result is the diagnosis that comes first: seeing the nasolabial fold not as a line to be erased, but as an object built by anatomy that must be understood before it can be genuinely and lastingly corrected.
FAQs about nasolabial folds in Dubai
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Are nasolabial folds just smile lines or wrinkles?
No, and this is the most important thing I explain to patients. A wrinkle is a crease in the skin, but the nasolabial fold is a shadow cast by a three-dimensional shift in the tissue above and below it. Calling it a smile line understates what is actually happening. The fold sits along a fixed boundary between two facial fat compartments, and it deepens as bulk accumulates above that boundary and support is lost below it. So what you see as a line is really the edge between a full area and a hollow one.
That distinction matters because it changes how the fold should be treated. If it were simply a skin wrinkle, a surface treatment would resolve it. Because it is a structural boundary with volume shifting around it, understanding that architecture is the first step toward correcting it properly.
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What actually makes the nasolabial fold deepen with age?
Two main forces working in opposite directions around a fixed line. Above the fold, the superficial malar fat pad descends with age, sliding down and medially and piling extra volume just above the crease. Below the fold, the deep medial fat compartment deflates and atrophies, so the support beneath the skin is lost and the tissue there collapses inward. The fold itself sits on a boundary anchored into the skin, so the bulk above cannot cross the line. The depth of the fold is essentially the difference in height between those two sides — fuller above and more hollow below. When I assess a patient, I am reading how much each of these forces is contributing, because that is what determines what a genuine correction would need to address.
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Why do fillers not fully correct my nasolabial folds?
Fillers can be excellent for fine lines, but the nasolabial fold has a specific anatomy that limits what volume alone can achieve. They work by adding volume below the crease to push the fold up from beneath. The problem is that the compartment boundary the fold sits on extends into the skin, so the fold is held down by a fixed tether that added volume simply cannot release. And if the descended bulk above the fold is not addressed, adding volume below can create a puffy, overfilled look rather than a smooth one.
The way I put it is that filler treats the shadow but does not move the objects casting it — the descended pad above, the tethered boundary, and the deflated compartment below. That is why deep, structural folds tend to resist surface volume, however skilfully it is placed.
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What does it mean that the fold is a compartment boundary?
The face is not covered in one uniform sheet of fat; it is organized into distinct compartments, each with its own borders. Imaging studies of these compartments have shown that the nasolabial fold runs right along the border between two of them. Crucially, that boundary is anchored into the overlying skin, which is why fat cannot simply flow across it. Volume that gathers on one side stacks up against a fixed edge instead of blending smoothly past it, which is what gives the fold its defined line.
I find this concept clarifies everything else about the fold. Once you understand that it is a tethered boundary rather than a fold in loose skin, it becomes obvious why the fullness above sits so sharply against it, and why releasing or repositioning structure matters more than adding surface volume.
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Why does pulling the skin tight not fix the fold?
Because the fold is not a problem of loose surface skin, so tightening the surface does not address what is actually creating it. An anatomic study of the fold found that traction on the deeper layer lateral to the fold can even deepen it, while traction on the more superficial layer softens it. That means the direction and the depth at which tissue is repositioned genuinely change whether the fold eases or worsens.
Simply pulling skin tight tends to flatten the fold in an unnatural way rather than resolve the underlying descent and deflation. This is why I regard the fold as something that responds to structure, not to surface tension. A natural correction has to work at the level of the descended pad and the deflated compartment, which is a very different thing from stretching the skin over the top of them.
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Does everyone’s nasolabial fold have the same cause?
No, and this is exactly why I assess each fold individually rather than applying one formula. The fold is built by more than one force, and the balance between them is different for every face. In one patient the fold is mostly descended bulk above, where the cheek has slid down over a sharp line. In another it is mostly deflation below, where the deep compartment has emptied and left a hollow. In most people it is a combination of both, layered over the fixed boundary.
Naming which force dominates is the whole point of a careful assessment, because it determines what a genuine correction would need to do. Treating a fold driven by descent as though it were a fold driven by deflation, or vice versa, is how results end up looking off.
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Can nasolabial folds be improved without a full facelift?
It depends entirely on which force is driving the fold and how advanced it is, which is why the assessment comes before any recommendation. For early or mild folds where the change is modest, more focused approaches can be appropriate. Where the fold is driven mainly by deflation, restoring lost volume in the right deep plane can do a great deal. Where it is driven by significant descent of the cheek, repositioning that structure is what genuinely helps, and no amount of surface work will substitute for it.
My role is to match the approach to the anatomy rather than to promise that one method suits everyone. The honest answer is that some folds are well served by less, and some genuinely need structural repositioning — and the only way to know which is yours is to read what is actually building the fold.
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How do you decide how to treat my nasolabial folds?
I begin by diagnosing the fold rather than the line. In a dynamic consultation I assess how much of your fold comes from descended bulk above, how much from deflation below, and how the fixed boundary is shaping the crease between them. From that reading I can tell which force dominates and therefore what a genuine correction would need to address — repositioning descended structure, restoring deflated volume, or both, always with respect for the tethered boundary the fold sits on. Only then does the question of technique arise, and I match it to your specific anatomy rather than to a default. The whole philosophy is that the fold is an object built by anatomy, so the treatment has to follow an accurate reading of that anatomy rather than simply chase the visible shadow.
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