Nasolabial Filling

What is nasolabial filling and how does it work?

The nasolabial folds are the two lines that run from the outer edge of each nostril down towards the corners of the mouth. They exist in every face and are part of normal anatomy; they become more noticeable over time as the midface loses volume, the skin becomes thinner and the fat compartments of the cheek descend slightly. What is often read as a “deep line” is in many cases a shadow created by that loss of support above the fold rather than a crease in the skin itself.

Nasolabial filling addresses this by placing an injectable gel — most commonly one based on hyaluronic acid, a substance the body already produces and holds water with — into or beneath the tissue along the fold. The gel restores part of the missing volume, which lifts the skin from below and reduces the depth of the shadow. The result is a softening of the line, not its complete removal, since the fold is a natural facial feature.

Depending on the assessment, product may be placed directly along the fold, higher in the cheek to support the area that has descended, or in both. Which approach is chosen depends on the anatomy of the individual face, and it is decided during the consultation rather than in advance.

In which situations is it preferred?

Folds that are visible at rest. When the line is still present with a relaxed, neutral expression rather than only when smiling, it usually reflects a loss of structural support and responds well to volume replacement.

A tired or downturned appearance around the mouth. Deepening nasolabial folds can make the lower face read as heavier or more severe than it feels. Softening the shadow often changes that impression more than any single other detail.

Asymmetry between the two sides. One fold is frequently deeper than the other. Filling can be used to bring the two sides closer to one another rather than to change the face as a whole.

As part of a wider plan. Nasolabial filling is often not a stand-alone answer. Where the underlying cause is midface volume loss, treating the cheek area may take pressure off the fold and require less product along the line itself.

How does the application proceed?

Assessment. The face is examined at rest and in movement. Medical history, current medications, previous injectable treatments in the area and any history of cold sores or skin conditions are reviewed. The depth of the fold and the state of the cheek above it determine the plan.

Preparation. The skin is cleansed and disinfected. A topical anaesthetic cream is usually applied and left to take effect; many filler products also contain a local anaesthetic within the gel itself, so the injection is generally described as tolerable rather than painful.

Injection. The product is delivered with a fine needle or a blunt-tipped cannula. A cannula moves through the tissue rather than piercing it repeatedly and is often preferred in this region. The session itself is short, and the practitioner checks the result at intervals while working rather than placing all the product at once.

Afterwards. The area may be gently moulded and cooled. Most people return to their normal day immediately. Mild swelling, redness at the entry points and occasionally small bruises are common in the first days and settle on their own.

Who is it not suitable for?

Nasolabial filling is a low-intervention application, but it is not appropriate for everyone:

• Active infection, inflammation or a skin lesion in or near the treatment area
• Known hypersensitivity to hyaluronic acid products or to lidocaine
• Pregnancy and breastfeeding
• Uncontrolled autoimmune or connective tissue disease, or ongoing immunosuppressive treatment
• Bleeding disorders, or blood-thinning medication that has not been discussed beforehand
• Recent or planned dental work, vaccination or a laser or peeling procedure in the same region — timing needs to be spaced out

When do results become visible?

A change is visible immediately, but the first appearance is not the final one. Swelling in the first two to three days can make the area look fuller than it will eventually be, and small bruises may need up to a week to fade. The product also draws water and settles into the tissue during this period.

The settled result is generally assessed at around two weeks. This is also when a follow-up review is useful: minor asymmetries can be corrected then, and it is normal for a small amount of additional product to be considered rather than everything being placed in the first session.

How long the effect lasts varies with the product used, the amount placed, the mobility of the area and individual metabolism. Hyaluronic acid is broken down by the body over time, so the effect is temporary and gradually diminishes rather than disappearing suddenly. Because the mouth region is constantly in motion, filler here tends to be metabolised somewhat faster than in less mobile areas.

Use together with other applications

Nasolabial folds rarely appear in isolation. Where the midface has lost support, filler applications in the cheek or jawline region may be planned first so that the fold is addressed from above. Where a downturn at the corners of the mouth accompanies the fold, botulinum toxin in the muscles that pull the corners down is sometimes considered as a separate step, spaced apart in time.

Skin quality is a separate matter from volume. Thin, sun-damaged skin over a well-supported fold will still show a line, and treatments aimed at skin texture are evaluated on their own terms. When several applications are combined, they are staged rather than performed on the same day, so that the response to each can be judged.

One reassuring feature of hyaluronic acid products is that they can be dissolved. An enzyme called hyaluronidase breaks down the gel, which means an unwanted result or an overfilled appearance can be reversed — an option that does not exist with permanent materials.

Frequently asked questions