Nasolabial Folds: What Causes Smile Lines and How to Reduce Them

The primary driver of deepening nasolabial folds is not repeated facial movement but the loss and descent of the medial cheek fat pad. Landmark research by Rohrich and Pessa in 2007 established that the face ages in distinct fat compartments — and the compartment directly above the nasolabial fold (the medial cheek fat) deflates and descends with age, removing the structural support that previously kept the fold shallow. This is why fillers placed in the fold itself produce a limited result: the problem is volume loss above the fold, not in the fold.

Collagen and elastin decline accelerate the effect. As collagen drops by approximately 1% per year after the mid-twenties, the skin becomes thinner and less able to support its own weight. The nasolabial crease becomes a permanent feature when the skin is too thin to spring back after each smile — what was once a dynamic expression line becomes a static structural fold. UV exposure significantly accelerates this collagen degradation, which explains why nasolabial folds are noticeably deeper in people with high cumulative sun exposure.

Body weight fluctuation is a third factor. Yo-yo dieting repeatedly stretches and contracts facial skin, which progressively reduces skin elasticity in the nasolabial area. Rapid significant weight loss in adulthood often produces more prominent folds because the fat volume is lost faster than the skin can contract. This is why slower, sustained weight management tends to produce better facial ageing outcomes than aggressive short-term dieting.

Dermal fillers — particularly hyaluronic acid fillers such as Juvederm Voluma or Restylane Lyft — are the gold standard for moderate to deep nasolabial folds. The key is correct placement: experienced injectors place filler in the deflated medial cheek above the fold to restore the volume that has descended, rather than injecting directly into the fold line itself. This approach lifts the fold from above rather than simply padding the crease, producing a more natural and durable result lasting 12–18 months.

Topical retinoids (vitamin A derivatives) are the best-evidenced non-injectable treatment for nasolabial folds. Tretinoin, the prescription-strength form, stimulates fibroblast activity and collagen synthesis — directly addressing the underlying thin-skin mechanism. Consistent use for 6–12 months produces measurable improvement in fold depth. Over-the-counter retinol requires longer timelines but is effective at lower concentrations. Vitamin C serum (L-ascorbic acid, 10–20%) applied in the morning protects existing collagen from UV-induced oxidation.

Collagen-stimulating treatments — including microneedling, radiofrequency (RF) devices, and ultrasound-based treatments (Ultherapy) — address the collagen component of fold deepening. These work by creating controlled micro-injury or heating the dermis, triggering a collagen repair response. Results accumulate over 3–6 months and are best for early to moderate folds. For deep, established folds, these treatments are more effective as maintenance after the volume deficit has been addressed with filler.

Retinoids (retinol, retinal, tretinoin) remain the most evidence-supported topical category for nasolabial fold improvement. They work by upregulating collagen type I production and increasing epidermal thickness — both directly counteracting the thin-skin mechanism. Start with a low-strength retinol (0.025–0.05%) and increase gradually to minimise irritation. Apply at night on dry skin, followed by a barrier-supporting moisturiser. Results are typically visible after 8–12 weeks of consistent use.

Peptides — particularly Matrixyl (palmitoyl pentapeptide-4) and Argireline (acetyl hexapeptide-3) — have growing evidence for mild collagen stimulation and expression-line reduction. They lack the potency of retinoids but are better tolerated for sensitive skin and can be combined with other active ingredients. Niacinamide (vitamin B3) supports the skin barrier and reduces transepidermal water loss, keeping the skin plumper and more resistant to fold deepening — it is one of the most versatile ingredients for facial aging.

Sunscreen is the single most impactful anti-aging ingredient available without a prescription. A broad-spectrum SPF 30+ applied daily reduces cumulative UV damage to existing collagen by an estimated 24% over 4.5 years, according to a randomised controlled trial. For nasolabial folds specifically, preventing further collagen loss while using retinoids to rebuild existing collagen is a two-front strategy that produces the most meaningful long-term results.

Facial massage performed consistently improves lymphatic drainage and local circulation in the nasolabial area, temporarily reducing the puffiness that can accentuate fold depth. Specific techniques that lift the cheek tissue upward and outward — working against the direction of gravitational descent — are most relevant. This is distinct from gua sha, which operates on similar principles of lymphatic drainage but uses a tool rather than just the hands. Neither replaces filler or retinoids for moderate to deep folds, but both are meaningful as daily maintenance.

Sleeping on your back reduces the nightly mechanical compression of facial skin that accelerates crease formation. Side and stomach sleepers show deeper nasolabial folds on the sleep-contact side of the face — a well-documented asymmetry. Silk pillowcases reduce friction but do not eliminate the compression factor. Back-sleeping, though difficult to adopt, is the single most impactful positional change for preventing fold deepening. Silk pillowcases are a useful secondary measure.

Nutrition that supports collagen synthesis — adequate protein (particularly glycine and proline from bone broth or collagen supplements), vitamin C, and zinc — provides the biological building blocks for ongoing collagen production. Staying well-hydrated maintains the water content of the dermis, which directly affects how prominent the fold appears. Dehydration causes a temporary but significant deepening of all facial lines including nasolabial folds.

Nasolabial folds are one of the primary cues that observers use to estimate facial age. Shallow, dynamic folds — those that appear only during expression and smooth out at rest — read as youthful. Static folds — those visible at rest without any expression — read as older regardless of other facial features. The depth and length of the fold at rest is one of the key variables that our AI age estimator uses when analysing how old a face appears.

Our age estimator assesses nasolabial fold depth as part of a complete facial aging analysis that includes skin texture, eye area aging, jawline definition, and overall skin quality. It gives you a real read on how your current fold depth affects your apparent age — which is the most useful starting point for deciding whether intervention is worthwhile and which type is most appropriate for your specific presentation.

Upload a neutral-expression photo in natural light at /guess-my-age for your estimated apparent age score and a breakdown of the aging features that contribute to it. The estimate is based on the same visual cues that human observers use, so it gives you a realistic sense of how your nasolabial folds are currently reading to others.