Botox or filler: they do different jobs

Half the consultations about injectables begin with a patient pointing at a line and asking for the wrong thing. Not because they are uninformed, but because the two most common treatments in aesthetics get discussed as if they were interchangeable strengths of the same idea, and they are not remotely the same idea.

The actual difference

A neuromodulator — Botox and its relatives — temporarily reduces a muscle's ability to contract. It treats lines made by movement.

A filler adds volume to a space that has lost it. It treats lines and hollows that are there when your face is still.

So the test is not where the line is or how deep it is. It is whether the line goes away when your face stops moving. Relax your face completely in front of a mirror. Lines that vanish are movement lines, and a muscle is making them. Lines that stay are volume lines, and no amount of relaxing a muscle will address them.

Which lines are which

Movement lines, as a rule: the horizontal forehead lines, the vertical frown lines between the brows, and the crow's feet at the outer corners of the eyes. These are the classic neuromodulator areas, and for good reason — they respond well and predictably.

Volume lines, as a rule: flattened cheeks, hollowing under the eyes, deepening of the fold from nose to mouth corner, thinning lips, and the loss of definition along the jaw.

The complication is that faces are not tidy, and most established lines are both. A frown line etched over fifteen years still shows when the face is still, because the skin has creased, and treating it properly often means relaxing the muscle first and then, after things have settled, deciding whether anything remains that volume would improve. In that order — because a great deal of what looks like a volume deficit resolves once the muscle stops folding the skin.

Timelines

A neuromodulator starts to work in about three to seven days, reaches full effect at around two weeks, and lasts roughly three to four months. You should be assessed at two weeks, not at three days, and a small adjustment at that visit is normal rather than a sign anything went wrong.

Filler is visible immediately, which is a mixed blessing — the immediate result includes swelling, and swelling is not the result. Expect a fortnight before judging it. How long it lasts varies widely by the product and the area.

Why so many results look wrong

Two reasons, and neither is the product.

Dose and placement are the entire craft. The same vial produces a face that moves normally and a face that does not, depending on how much went where. The frozen forehead is an overtreatment of one muscle group without attention to the ones that balance it.

Volume used to chase movement. Filler placed to fill a line that a muscle is actively creating does not fix the line, and it accumulates. This is most of what people recognise as an overfilled face: not one bad decision, but years of adding volume to a problem that was never a volume problem.

Faces are also not generic. A man's brow sits lower and heavier, the skin is thicker, and the muscle takes a larger dose to move — treated with a dose and a pattern designed for a woman's face, the result is the obvious one everyone can spot.

How to start

Conservatively, with the movement lines, and with a plan to be seen again in two weeks. Neuromodulator wears off, which makes it a genuinely low-stakes place to begin: if you dislike it, it resolves. Filler is reversible in some forms and long-lasting in others, and it is better entered into once you know what your face does without the muscle pulling on it.

The result worth asking for is not an absence of lines. It is a face that still moves and looks like it has had a good year.