Deeper Smile Lines? What's Really Happening Beneath Your Skin

The nasolabial fold exists in every face at every age, it is a natural anatomical crease, not a flaw that appears one morning. What changes with age is its depth, and the reason for that change sits several millimetres below the skin's surface.

The midface is built in layers. Beneath the skin lies a layer of subcutaneous fat, but this fat is not one continuous sheet. It is divided into distinct compartments, the medial cheek fat, the middle cheek fat, and the nasolabial fat compartment among them. Above these sit the malar fat pad, a larger volume of fat that gives the upper cheek its fullness in youth.

These fat compartments are held in position partly by retaining ligaments, fibrous structures that anchor soft tissue to the underlying bone. The most relevant one here is the zygomatic ligament, which tethers the cheek tissue to the cheekbone. Over time, as the ligament loosens and the fat compartments lose volume and density, gravity pulls the malar fat pad downward and forward. It does not disappear. It migrates, and it stacks up against the nasolabial crease, which acts as a fixed boundary.

This is the part most cosmetic marketing skips. The nasolabial fold deepens through two distinct mechanisms, and they often happen simultaneously. The first is descent, fat moving south. The second is volume loss in the compartments above, which removes the structural support that once kept tissue elevated. When the malar fat pad drops, it creates a shadow and a ledge at the crease. When the sub-malar area loses volume, the skin above the fold looks hollow, making the fold below appear more prominent by contrast.

Bone resorption adds a third layer. The maxilla, the bone of the upper jaw, recedes with age, particularly around the pyriform aperture near the nose. Less bony support means the overlying soft tissue has less scaffolding, and the fold deepens further regardless of what is happening in the fat compartments.

Because the fold deepens through at least three mechanisms, fat descent, volume loss, and bone resorption, no single intervention addresses all of them. Hyaluronic acid fillers placed directly into the fold can soften its appearance, but injecting into the fold itself without addressing the descended tissue above often produces an unnatural ledge. Most practitioners who work with facial anatomy now focus on restoring volume to the midcheek and lifting the descended fat pad rather than filling the fold directly.

Energy-based devices that stimulate collagen in the dermis may improve skin quality and laxity but do not reposition fat compartments. Thread lifts aim to mechanically lift descended tissue, with results that typically last in the range of one to two years and vary considerably between individuals. Surgical approaches, specifically the deep-plane facelift, which works at the level of the SMAS and the retaining ligaments, address fat pad descent more directly than any non-surgical option, though recovery is significantly longer and the decision involves real surgical risk.

None of these options is appropriate for everyone. People with very thin skin, certain autoimmune conditions, or active skin infections in the treatment area are not candidates for injectable or device-based work. Anyone considering an intervention should have an in-person consultation with a qualified dermatologist or plastic surgeon who can assess their specific anatomy, not a photograph.

A nasolabial fold that is visible at rest but not dramatically deep is a normal feature of an adult face. The fold becomes more pronounced with smiling because the levator labii superioris muscle, which lifts the upper lip, inserts near the crease and pulls on it with every expression. This is not pathology. If the fold does not bother you, there is no clinical reason to treat it. The decision to intervene is aesthetic, not medical, and the risks of any procedure are real whether the result looks natural or not.

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