Nasolabial fold filler
'Smile lines' filler · the most over-treated fold
'Smile lines' remain one of the commonest filler requests, and the gap between what patients ask for and what experienced injectors do about the fold is a recurring theme in dermatology press and on Reddit.
The fold is where the face is falling, not where it is empty; fill the cause, then decide whether the line still needs anything.
Reviewed against the Aesthetics International standard. Category: Injectables.
Does Nasolabial fold filler work?
Established. The fold is where the face is falling, not where it is empty; fill the cause, then decide whether the line still needs anything. The nasolabial fold is the most-trialled filler site: a 2021 meta-analysis of randomised trials found consistent improvement on a wrinkle severity scale that was still present at twelve months, with lumpiness, tenderness, swelling and bruising common and serious events rare.
- Verdict
- Established Long clinical track record. Results depend on selection and technique more than on the device.
- Evidence base
- 3 PubMed-indexed studies cited below, including systematic reviews.
- Suits
- A fold that remains after midface support has been addressed, or a true static crease in a face without much descent.
- Not for
- Folds caused by heavy, descended cheeks (filling adds weight); over-filled faces; anyone sold 'smile line filler' as the first and only step.
- In Singapore
- Hyaluronic acid fillers are HSA-registered devices injected by doctors in Singapore.
- Category
- Injectables
- Reviewed
- 1 October 2026 by Aesthetics International. Revised as evidence and regulation change.
What it is
Filler placed in or beside the nasolabial fold, the crease from nostril to mouth corner. It is the indication on which most fillers were first licensed, and the one most often done for the wrong reason: the fold is usually a symptom of midface descent and deflation, not a line that needs filling.
How it works
The fold deepens when cheek fat slides down and bone support recedes, so the skin above the fold hangs over the fixed skin below it. Filling the crease itself flattens it a little but adds weight to the hanging side, which is why directly filled folds look heavy. Restoring support in the cheek and the fold's upper, alar end softens it with less product; shallow micro-droplets can finish the line.
What the evidence says
The nasolabial fold is the most-trialled filler site: a 2021 meta-analysis of randomised trials found consistent improvement on a wrinkle severity scale that was still present at twelve months, with lumpiness, tenderness, swelling and bruising common and serious events rare. Comparative meta-analyses find few meaningful differences between gel types. The evidence that the fold should be filled directly is weaker than the evidence that filling it works; anatomical reviews now frame the fold as a consequence of midface change.
What people are saying
Paraphrased from public discussion on TikTok, Instagram, Reddit and in the press. Not testimonials, and not about any one clinic. Reported in: realself.com.
What the studies show
- systematic review
Pooled wrinkle severity scores improved markedly at one month and were still better than baseline at twelve months; lumpiness, tenderness, swelling and bruising were the common adverse events.
Tissue Fillers for the Nasolabial Fold Area: A Systematic Review and Meta-Analysis of Randomized Clinical Trials — Aesthetic Plastic Surgery, 2021. PMID 34255156.
- systematic review
Monophasic and biphasic gels gave broadly similar correction of nasolabial folds with differences in individual adverse events rather than overall outcome.
Monophasic versus biphasic hyaluronic acid filler for correcting nasolabial folds: a systematic review and meta-analysis — Journal of Cosmetic Dermatology, 2022. PMID 34817919.
- review
The fold is classified by its underlying cause (deflation, descent, skin crease or combination) and treatment is matched to that cause rather than filled uniformly.
Anatomical-Based Diagnosis and Filler Injection Techniques: Nasolabial Folds — Journal of Craniofacial Surgery, 2025. PMID 40900149.
Studies are selected for relevance and quality, not for agreement with the verdict; PubMed records are linked so the reader can check them.
Who it suits
Suits
A fold that remains after midface support has been addressed, or a true static crease in a face without much descent.
Not for
Folds caused by heavy, descended cheeks (filling adds weight); over-filled faces; anyone sold 'smile line filler' as the first and only step.
Alternatives
The two reviewed treatments most often weighed against Nasolabial fold filler, on the same standard.
| Nasolabial fold filler | Hyaluronic acid dermal fillers | Masseter slimming injections | |
|---|---|---|---|
| Verdict | Established | Established | Established |
| What it is | Filler placed in or beside the nasolabial fold, the crease from nostril to mouth corner. | Hyaluronic acid fillers are gels of cross-linked hyaluronic acid, a sugar molecule found naturally in skin, injected to restore volume, support structure or smooth lines. | Botulinum toxin, a prescription medicine, injected into the masseter, the thick chewing muscle at the angle of the jaw. |
| Evidence base | 3 PubMed-indexed studies cited below, including systematic reviews. | 5 PubMed-indexed studies cited below, including systematic reviews, meta-analyses, randomised trials. | 4 PubMed-indexed studies cited below, including systematic reviews, randomised trials. |
| Suits | A fold that remains after midface support has been addressed, or a true static crease in a face without much descent. | Volume loss in the midface, temples, chin and jawline; lips and lines in people who want a reversible, immediate result; structural support placed deep by an injector who assesses the whole face. | A genuinely bulky masseter that squares the lower face, and clenchers or grinders who cannot tolerate a splint. |
| In one line | The fold is where the face is falling, not where it is empty; fill the cause, then decide whether the line still needs anything. | Placed deep, in the right compartment, by someone who can dissolve it, HA filler is the most reversible structural tool in aesthetics. The problems come from the under-eye, from top-ups without reassessment, and from anyone who cannot name the artery they are avoiding. | The jaw is a muscle you use a thousand times a day; weaken it as much as the face needs and no more. |
Risks
Lumps, asymmetry, a heavy upper lip, and vascular occlusion of the facial or angular artery, which runs through this area and makes it one of the higher-risk filler sites.
In Singapore
Hyaluronic acid fillers are HSA-registered devices injected by doctors in Singapore.
“The fold is where the face is falling, not where it is empty; fill the cause, then decide whether the line still needs anything.”
Vetted protocols on the same problem
Questions
Why won't my doctor just fill my smile lines?
What works instead?
Is nasolabial filler dangerous?
Cite this review
Aesthetics International (2026). Nasolabial fold filler: does it work? Evidence, risks and verdict. https://aesthetics-international.org/treatments/nasolabial-fold-filler/ (reviewed 1 October 2026).
Editorial, unpaid and independent of any manufacturer. Verdict: Established. See what works and what doesn't across all 153 reviews. Spotted an error or a newer study? Suggest a correction — changes are logged on the corrections page. Terms are defined in the glossary.
Where this review is used
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