The Complex: Three Muscles, One Wrinkle
In one line
Frown lines are produced by the combined action of the corrugator (which pulls the brows inward), the procerus (which pulls downward), and sometimes the depressor supercilii. The treatment targets the whole complex.
The area between the brows — the glabella — is one of the most "readable" areas of the face. When a person frowns, concentrates, gets angry, or thinks — the muscles in the glabella contract and create one or two vertical lines (the famous "11s"). Over the years, the repeated contraction etches the lines into the skin.
The corrugator supercilii is the main muscle. It sits above the brow bone and pulls the brows inward and down — the movement of frowning. The procerus is a smaller muscle located between the brows and pulls the skin downward, creating a horizontal wrinkle on the bridge of the nose.
This complex is active even unconsciously. Many people frown when reading, driving, looking at a screen, or going out into the sun. Some patients come in with "everyone tells me I look angry" — even though they aren't. This is the area in which botox delivers the highest level of patient satisfaction.
Why the Glabella "Allows" a Higher Dose
Unlike the forehead — where over-blocking causes brow drop — in the glabella the situation is the opposite: the corrugator pulls the brows down. Blocking it actually allows the frontalis to lift the brows more freely. Therefore, a sufficient dose in the glabella doesn't just soften the line — it may also contribute to "opening up" the look.
That said, there is a limit here too. An excessive dose can create an unnatural "spacing" between the brows, or produce a sensation of lost control over brow movement. The goal is modulation, not elimination.
Treatment Planning: Injection Points and Dose
Standard treatment of the glabella includes 5 injection points: one point in the procerus and two points in each corrugator. But "standard" doesn't mean "the same for everyone." Individual tailoring matters:
- Muscle thickness: strong glabellar muscles (more common in men) require a higher dose.
- Movement pattern: not everyone frowns the same way. In some, the corrugator is dominant; in others, the procerus. Mapping the movement before injection helps calibrate the dose.
- State of the wrinkle: a line etched even at rest (static) will not disappear completely with botox. Botox will prevent deepening, but a combination with skin-quality improvement or gentle filler of the line may be needed.
- Balance with the forehead: as noted, treatment of the glabella "releases" the frontalis. If the forehead is also being treated, the balance has to be calculated.
| Characteristic | Dynamic wrinkle | Static wrinkle |
|---|---|---|
| When visible | Only during frowning/concentration | Also at complete rest |
| Depth | Superficial–moderate | Deep, etched |
| Response to botox | Excellent — almost completely disappears | Partial — improves but does not vanish |
| Combination needed? | Usually not | Sometimes yes — skin improvement or gentle filler |
Results and Limitations
The glabella is the area with the highest satisfaction rate in botox treatments. The reason is simple: frown lines are almost always dynamic (at least initially), the mechanism is clear, and the result is noticeable. Patients report looking less angry, less tired, and more relaxed — even if the number of lines elsewhere on the face hasn't changed.
But it's important to set expectations:
- A deep line etched over years will not disappear after the first treatment. It will improve and be prevented from deepening — but "erasure" sometimes requires a series of treatments or a combination of approaches.
- Some patients feel "strange" in the first few days because they try to frown and can't. This passes within days — the brain adapts.
- Asymmetry in the glabella area is common. Sometimes one side responds faster than the other. If asymmetry remains after two weeks, a targeted touch-up can correct it.
The Glabella as a Starting Point
For patients trying botox for the first time, the glabella is often a good place to start. Risk is low, satisfaction is high, and the result looks natural because it removes an "angry look" without dramatically changing the face. This lets the patient get a feel for what botox is before deciding on additional areas.
Frequently Asked Questions
How many units are needed for the glabella?
The dose varies. For women — typically 15–25 units. For men, the glabellar muscles are usually thicker, so the dose is higher — 25–40 units. These are general ranges; the exact dose is determined in an individual assessment.
Does the treatment prevent future wrinkles?
To some extent, yes. If the muscle doesn't contract — it doesn't etch the line. Patients who begin treatment at the dynamic stage (before the line has become etched) may prevent the transition to a static wrinkle. It's not "absolute prevention" — but it halts the worsening.
After botox in the glabella — can I still express emotions?
Yes. Botox softens frowning — it doesn't completely eliminate it (assuming a conservative dose). Smiling, surprise, sadness — all of these keep working. What changes: the extreme frown, the one that etches the line, is moderated.
Want to find out what’s relevant for you?
You can book a short consultation to assess the glabella area and understand what is possible and what is realistic. No obligation.