PDO threads in the nasolabial fold: indication and limits
- Highlighted area
Quick facts
- Central question
- Does the nasolabial fold improve with a lifting thread, or does the thread only treat the cause above it (descent of the midface)?
- Key idea
- The fold is a consequence of volume loss and midface descent; the thread acts on support, while filler acts on the fold and on volume.
- Structures to watch
- The facial and angular arteries, which run alongside the fold, and the nearby oral mucosa.
- Prudent stance
- Define the dominant component, avoid promising to erase the fold with threads and choose the most coherent strategy or combination.
The nasolabial fold (the "smile line") is one of the most frequent concerns and one of the most misunderstood. The patient sees a line and wants to fill the line. The professional knows that, often, the fold is a consequence of something happening higher up: the midface has lost volume and descended, and tissue piles up against the crease. So the choice between threads and filler stops being a duel of techniques and becomes a diagnostic question.
This guide is a review. It explains what each option treats, what to expect from the thread, the risks and how to choose. It does not include insertion technique, vectors or protocol, which are decisions for the qualified professional, according to the rules of their professional council. For an overview of the evidence, see PDO threads: what the literature shows.
What forms the nasolabial fold?
The nasolabial fold separates the cheek from the upper lip and the nasal ala. Everyone has one, and it deepens over time through a combination of factors: descent and volume loss of the midface, which push tissue against the crease; bone resorption of the maxilla; ligament laxity; the movement of smiling itself; and loss of skin elasticity. The nasolabial compartment and the cheek fat take part in this picture.
That is why the same appearance of a deep fold can have different causes in two patients, and the strategy should follow the cause. See facial assessment by thirds to organize the midface exam.
What does the thread do and what does filler do?
| Option | What it does | What it does not do | Reversal |
|---|---|---|---|
| Lifting thread | Subtly repositions midface tissue and may soften the fold indirectly | Does not fill the fold or replace volume | Not reversible with hyaluronidase; requires removing the thread, when indicated |
| Smooth thread | Stimulates the skin in fine lines | Does not treat a deep fold on its own | Same |
| Hyaluronic acid filler | Fills the fold and/or replaces midface volume | Does not solve significant laxity | Reversible with hyaluronidase |
| Biostimulator | Improves tissue quality and firmness | Gradual effect, no immediate filling of the fold | No simple antidote |
The central point is top-down logic: if the fold is a consequence of midface loss and descent, treating the midface is usually more coherent than treating the fold alone. That can be done with volume (filler or biostimulator) or with support (thread), depending on the dominant component. Direct filling of the fold is usually used as a refinement. See nasolabial fold filler and the patient-oriented comparison in deep fold: filler or threads.
When can the thread play a role?
In mild to moderate laxity, with midface descent and reasonable skin quality, lifting threads are described as a subtle repositioning option that can soften the fold indirectly. In fine lines, smooth threads are used with a stimulation goal. The effect is usually subtle and of limited duration, and in deep folds or with a lot of lost volume, a thread alone is almost never enough. A patient who expects the fold to be "erased" with threads will be disappointed.
It is also worth remembering that the initial result includes swelling, and that dimples and waviness in the first days are common. The real effect should only be judged after the tissue has settled. The general literature on threads is in types of PDO threads.
What are the risks of threads in this area?
The general thread events apply: pain, swelling, bruising, dimples, asymmetry, palpable thread, extrusion and infection. In the nasolabial fold, the following deserve emphasis:
- Vascularization: the facial artery and the angular artery run alongside the fold and the nasal ala, and bruising and, rarely, vascular occlusion are recognized risks; see vascular occlusion in the nasolabial fold;
- Proximity to the oral mucosa: paths that approach the mucosa increase the risk of infection and of extrusion into the mouth;
- Mobility: the area moves a lot when smiling and talking, and dimples and pulling are more evident;
- Asymmetry: the fold is usually asymmetric by nature, and an uneven correction is easily noticed.
Management of each event is in complications with PDO threads and dimpling and irregularity.
How to combine strategies?
In many patients, the most coherent plan is combined and staged: first the base (midface volume or support), then refinement of the fold. The order and interval depend on the case and are the professional's decision. Patients usually like to understand that the fold is the "last" point to be treated, not the first. If the plan includes filler, remember the availability of hyaluronidase. If it includes a biostimulator, see biostimulator in the nasolabial fold and biostimulator in the midface.
What should you tell the patient?
A simple image helps: the fold is like the crease of a fabric that has lost its stuffing. Filling the crease helps, but if the fabric has dropped, you also need to lift the base.
What about Harmy?
Harmy does not simulate threads, but it has the Nasolabial Fold point, with an illustrative projection of volume in ml, and the Cheekbone point. This lets you show the patient two alternatives side by side: treating the fold or treating the midface, which usually clarifies the "top-down" logic. The "Maintenance" shortcut uses the fold with 1 ml Subtle, and "Full harmonization" includes cheekbone with 2 ml and fold with 1 ml, both Moderate. The simulation is illustrative.
Summary
A lifting thread does not fill the nasolabial fold: it subtly repositions the midface and may soften the fold indirectly. Filler treats the fold and the volume. The choice depends on the dominant component, and the area demands respect for the vascular anatomy. Combine in stages, document and be frank about the limits.
Frequently asked questions
Do PDO threads eliminate the nasolabial fold?
Generally not. A lifting thread acts on the descent of tissue and may soften the fold indirectly and subtly. To fill the fold itself, filler is usually used, at the professional's discretion.
Threads or filler for smile lines?
It depends on the cause. If midface volume loss predominates, filler or volume replacement is usually more coherent. If there is tissue descent, a thread may help subtly. Strategies are often combined.
Are PDO threads in the nasolabial fold risky?
The fold is a vascular area, with the facial and angular arteries nearby. Threads carry risks such as bruising, asymmetry, a palpable thread and infection, and the area requires knowledge of the anatomy and clear consent.
Does a smooth thread work in the nasolabial fold?
Smooth threads are described for stimulating the skin in fine lines, with a subtle result and limited evidence. In deep folds, the effect is usually not enough on its own.
Harmy images are illustrative simulations generated by AI from the patient's photo to support the conversation between practitioner and patient. They are not a promise of results. Indication, technique, product and volume are solely the decision of the licensed practitioner. This content is for information only and does not replace a clinical assessment.