PDO threads or hyaluronic acid: which to choose
There is no overall "best": hyaluronic acid restores volume and support, PDO threads provide subtle repositioning and stimulate collagen in mild to moderate laxity, and botox relaxes the muscles that form expression lines. They are tools for different concerns. The right choice starts with the question "what is causing what the patient sees in the mirror?".
This page helps you translate that difference into the patient's language, since patients arrive asking "threads or filler?" as if they were options for the same thing.
What does each one do, in one sentence?
- Hyaluronic acid: a gel that takes up space. It restores volume (volumization), provides support and defines contours. It can be broken down with hyaluronidase.
- PDO threads: absorbable threads inserted under the skin. Smooth ones stimulate collagen; barbed ones, the thread lifts, slightly reposition tissues.
- Botulinum toxin (botox): relaxes muscles and softens dynamic wrinkles, the ones that appear with expression.
Comparison table in the patient's language
| Patient's question | Hyaluronic acid | PDO threads | Botox |
|---|---|---|---|
| What does it treat? | Lack of volume, folds, contour, lips | Mild to moderate laxity, skin firmness | Expression lines, muscle strength |
| Does it change the shape of the face? | It can, in the treated areas | Little; repositions subtly | No, except in muscles like the masseter |
| When do I see the result? | Right away, with swelling; final in 2 to 4 weeks | Partly right away; collagen over weeks to months | In days, complete in about 2 weeks |
| How long does it last? | Usually 6 to 18 months, depending on the area | The thread is absorbed over months; the effect may last a little longer | Usually 3 to 6 months |
| Can it be undone? | Yes, with hyaluronidase | Not with an enzyme; removal only in specific situations | No; the effect wears off on its own |
| Recovery | Swelling and possible bruising for days | Pain when moving the face, pulling sensation, swelling | Minimal; care in the first hours |
Ranges vary with product, technique and patient. The duration of each procedure is detailed in how long does facial harmonization last? and the duration of threads in how long do PDO threads last?.
How do you choose based on the concern?
| What the patient says | What is usually behind it | Usual tendency |
|---|---|---|
| "My face is sagging" | Volume loss in the midface, with or without laxity | Often volume and support first; threads can complement |
| "I lost my jaw definition" | Mild laxity, loss of bone definition | Filler in the jawline, threads or both, depending on the cause |
| "I have smile lines" | Shadow from loss of support in the cheekbone and a marked fold | Usually starts with volume; see smile lines: what softens them |
| "My skin is soft, without firmness" | Diffuse collagen loss | Smooth threads or biostimulator; see biostimulator or PDO threads |
| "I have lines on my forehead and between my eyebrows" | Muscle contraction | Toxin; threads and filler do not treat the cause |
| "I want bigger lips" | Lip volume and contour | Hyaluronic acid; threads have no role here |
| "I want to lift my face without surgery" | Expectation of a lift | Align expectations; marked laxity calls for surgical assessment |
PDO threads or botox?
They get compared because they appear together in the same ad, but they act on different things. Botox does not firm skin or lift tissue: it reduces the strength of muscles. In some places that strength pulls the face downward, as with the muscle that lowers the mouth corner, and relaxing it can give a feeling of lightness. Still, that is not the effect of a thread. The comparison with filler is in botox or hyaluronic acid.
When does it make sense to combine them?
In many faces, the most coherent plan combines them: volume where support is lacking, threads where there is mild laxity, toxin where there is excess muscle strength. The order and interval are up to the qualified professional, according to the assessment and the rules of their professional council (in Brazil, CFM, CFO and others). Same-day combinations are covered in botox and filler on the same day.
And what about the risks of each?
Both have risks and neither is exempt. Hyaluronic acid carries the risk of vascular occlusion, more relevant in areas such as the nose, glabella and nasolabial fold, which is why hyaluronidase must be available. Threads have their own risks, such as irregularities, asymmetry, palpable thread, extrusion and infection, detailed in PDO threads: risks. With both, swelling and bruising are expected in the first days.
A practical difference: hyaluronic acid can be broken down if the result is not pleasing; a thread generally cannot be undone with an enzyme.
Where does Harmy fit in?
Harmy does not simulate threads: the projection works with volume in the marked areas, such as Cheekbone, Nasolabial Fold and Jawline, with the ml for each one. That helps precisely in this conversation: showing the patient how much of the "sagging face" concern improves with volume alone, before deciding whether threads belong in the plan.
Frequently asked questions
Which is better, PDO threads or hyaluronic acid?
It depends on the concern. Hyaluronic acid restores volume and supports areas that have lost structure; PDO threads provide subtle repositioning and stimulate collagen in mild to moderate laxity. Often the plan combines both.
PDO threads or botox: what is the difference?
They are different things. Botulinum toxin relaxes muscles and treats expression lines; threads act on skin laxity and firmness. One does not replace the other.
Do PDO threads replace filler?
No. Threads do not restore lost volume. When the face looks sagging because of lost volume and support, filler usually plays a bigger role than threads.
Can you have PDO threads and filler together?
They can be part of the same plan, on the same day or in stages, depending on the professional's assessment. The order and interval depend on the areas and the technique.
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.