Botox or Hyaluronic Acid Filler: Which Should You Choose?

Botox (botulinum toxin) and hyaluronic acid do not treat the same thing: the first softens dynamic lines, those that form when you contract a muscle (frown lines, forehead lines, crow's feet), while the second restores lost volume and the creases that are visible at rest (nasolabial folds, lips, hollow under-eyes). The right choice therefore depends on the nature of what you wish to correct, not on a preference for one product.

In many faces both problems coexist and a combined treatment makes sense. But the choice is made at a consultation, after an examination of your face at rest and in movement, your history and your expectations. No result can be guaranteed and the quote is only provided after this examination.

Here is how the two products work, what they can and cannot do, and how to avoid the dreaded frozen look.

What Botox really treats

Botulinum toxin temporarily blocks the transmission between nerve and muscle. The injected muscle contracts less, and the skin over it creases less. It therefore acts on expression lines: frown lines between the eyebrows, horizontal forehead lines, crow's feet at the corner of the eyes. It can also slightly correct the position of the eyebrows or soften bands in the neck.

It fills nothing. A deep line that has become static does not disappear completely with toxin alone: it may soften, but it cannot be filled.

What hyaluronic acid treats

Hyaluronic acid is a molecule naturally present in the skin, capable of retaining water. Injected as a gel, it restores volume or hydration. Depending on its density, it is used to fill nasolabial folds, reshape the lips, restore volume in the cheekbones or temples, soften hollow under-eyes or define the chin.

Unlike Botox, it does not act on the muscle. It does not remove frown lines or forehead lines caused by contraction. Very fluid gels (skin boosters) mainly improve the quality and hydration of the skin.

Botox and hyaluronic acid: the comparison table

Frown lines: Botox or filler?

Frown lines, between the eyebrows, are the classic case where Botox is the treatment of reference: they result from the repeated contraction of the muscles that pull the eyebrows together. Injecting them with hyaluronic acid is rarely appropriate and carries vascular risks in this delicate area.

For a line that is already well marked at rest, a toxin to calm the muscle and a very soft gel to soften the crease may sometimes be combined. This decision depends on the examination and is never improvised.

Combining the two: when it makes sense

Facial ageing combines loss of volume, loosening of tissues and expression lines. Combining the two products allows each component to be treated: toxin for the upper face, hyaluronic acid for the middle and lower thirds.

• Botox for the forehead and crow's feet, filler for the cheekbones and folds.
• Toxin for a ‘gummy smile’ or a dimpled chin, gel for the lip contour.
• Skin booster for glow, toxin for dynamic lines.

Sessions may be carried out on the same day or spaced apart. The key is to stay restrained: treatment is added gradually rather than corrected all at once.

A frozen face: a question of dosage, not of product

A frozen face, heavy brows or a lifeless gaze are not faults of Botox itself. They come from an excessive dose, a poorly chosen injection point or a lack of analysis of your facial expressions. In the same way, a puffy face or disproportionate lips are the result of excess volume, not of hyaluronic acid.

Risks, side effects and contraindications

These are medical procedures and are not trivial. Common effects are minor: redness, small bruises, swelling or tenderness at the injection site. Others are rarer but possible: asymmetry, drooping of an eyelid or eyebrow with toxin, lumps or irregularities with gels.

The most feared complication of fillers is vascular occlusion, by injection into or compression of a blood vessel, which can lead to skin necrosis and, very rarely, visual disturbance. This is why injection must be carried out by a doctor trained in anatomy and emergency procedures, with hyaluronidase within reach.

• Pregnancy and breastfeeding: injection is advised against as a precaution.
• Certain neuromuscular diseases (myasthenia gravis, Lambert-Eaton syndrome): a contraindication to toxin.
• Active skin infection or an active cold sore in the area to be treated.
• Known allergy to a component of the product.
• Certain medications or clotting disorders: to be mentioned at the consultation.

What a consultation involves

The consultation allows your face to be observed at rest and in movement, your history to be gathered and a realistic goal to be defined. The cosmetic surgeon explains what is feasible, what is not and the alternatives, including doing nothing. A written quote is then provided, with no obligation.

The session itself lasts 15 to 30 minutes. Activities resume almost immediately, but intense exercise, saunas and alcohol are avoided on the day. A check-up at two weeks allows adjustments. The effects are temporary in both cases: regular maintenance is needed to keep the effect.

After treatment: advice and maintenance

In the hours after an injection, avoid massaging the area, avoid lying flat for four hours after a toxin, and avoid intense exercise or a sauna for 24 hours. A little swelling or redness usually disappears within a few hours to a few days. A check-up at two weeks allows the effect to be reviewed and, if needed, a measured touch-up to be made.

Both treatments are temporary: without renewal, the face gradually returns to its previous state. This is not a flaw; it is their reversible nature that also contributes to their safety. Plan for this maintenance schedule before starting, rather than discovering it afterwards. Choosing a trained practitioner who works with products of traceable origin remains the best guarantee of safety.