Forehead and hairline in the facial analysis for the plan
- Muscle
- Highlighted area
Quick facts
- Goal
- Read forehead height and hairline and know what limits the upper third plan
- Reference
- Upper third: from the hairline to the glabella, compared with the other two thirds
- Main limit
- The frontalis holds up the eyebrow; weakening it too much drops the gaze
- Caution
- A mobile, receding or actively thinning hairline calls for caution and documentation before planning
The forehead is the area where patients most often confuse what they ask for with what they need. They ask to "remove the forehead lines", and whoever plans must first answer other questions: how tall is this forehead, where does the hair start, how does the eyebrow behave at rest, and how hard is the frontalis muscle working to compensate for the gaze.
This page covers reading the forehead and hairline in the upper third and what that limits in the plan. It complements the general step-by-step in facial analysis in HOF and the frontal view in frontal facial analysis: checklist.
What makes up the upper third?
The upper third runs from the hairline to the glabella, the point between the eyebrows. Reading it involves four elements that influence each other:
- Forehead height, compared with the middle third and the lower third.
- Hairline, with its shape (straight, rounded, "M"-shaped), symmetry and recession at the temples.
- Frontal bone and brow ridges, which give the base of the shape and projection.
- Eyebrows, the resting position and the behavior in movement.
The frontal bone and the brow ridge define what injectables do not change. The nasion serves as a landmark between the forehead and the nose, especially in the profile view.
How do you measure forehead height without being misled?
The classic measurement compares the three thirds: the face is divided into hairline to glabella, glabella to the base of the nose, and base of the nose to the chin. Similar thirds are usually read as harmonious, but real faces vary, and the division is there to locate a disproportion, not to impose equality.
Three traps come up all the time:
- Mobile hairline. Pulled-back hair, bangs, a quiff or styling product change the apparent height. A photo with loose hair changes the reading.
- Receding hairline and hair loss. The upper third may be widened by recent recession or ongoing balding, and the "high forehead" is not even anatomical.
- Tilted photo. A raised chin shortens the lower third and makes the forehead look proportionally larger. Level the head on the Frankfurt plane.
The influence of hair in the photo is covered in hair, earrings and glasses in the assessment photo.
How does the hairline change the conversation?
| Situation | How the plan is usually read |
|---|---|
| High forehead, stable hairline | The area may look large; the plan does not need to "shrink" it, just respect the proportion |
| High forehead from recession or ongoing balding | Record the progression, avoid promising a change in proportion and advise a hair assessment if it bothers the patient |
| Low forehead, eyebrow close to the hairline | Caution with the frontalis; any weakening should be assessed in movement |
| Asymmetric hairline | Record it beforehand; a preexisting asymmetry is not an effect of the treatment |
| Very fine or sparse hair at the temples | The temple hollow may look bigger; see the temples view |
A common situation is a forehead that looks "huge" in the photo because the hair is pulled back. The conversation with the patient gets clearer when you show the photo with loose hair and the assessment photo side by side.
The frontalis: the muscle that holds up the gaze
The frontalis muscle is the only eyebrow elevator. It creates the horizontal forehead lines, and many patients use it all the time to keep the gaze open. In people with heavier eyelids, low eyebrows or a short forehead, the frontalis is compensating, and weakening it too much can drop the eyebrow and give a tired look.
That is why assessing the upper third has a step in movement. Ask the patient to relax the forehead with eyes closed and then open them without raising the eyebrows. If the eyebrow drops or the eyelid feels heavy, the frontalis is compensating, and the forehead plan needs to be more conservative. The muscle map is in facial muscles in botulinum toxin.
What about dynamic and static forehead lines?
Forehead lines can be dynamic, appearing with movement, or static, staying visible at rest. The patient's concern usually mixes the two. Ask them to relax and look at the resting photo: if the line is still visible, it already has a static component, and toxin alone usually resolves only part of the picture.
| Feature | Dynamic lines | Static lines |
|---|---|---|
| Appear | Only when expressing | Also at rest |
| Relationship to the muscle | Direct | Partial, with loss of skin quality |
| Expectation to align | Softening while the effect lasts | Partial improvement, with a possible combination of approaches |
In any case, align expectations with words like "soften" and "usually", never "eliminate".
How does the forehead relate to the glabella, eyebrow and temples?
The upper third is a unit. Working on the forehead without looking at the glabella and eyebrow can upset the balance: the glabellar depressors pull the head of the eyebrow down, the frontalis pulls it up, and the resting position is the result of that tug of war. The integration of the two areas is in glabella and forehead: combining them in the plan.
The temples, in turn, complete the frame of the upper third. When they are hollow, the forehead looks wider and the hairline more receded. The assessment of this effect is in the temples area and involves structures such as the temporal fat pad and the temporal fasciae.
What should you tell the patient?
Also explain that the treatment does not change the forehead height or the shape of the hairline. Avoid the expression "big forehead" and use "longer upper third", which describes the proportion without judgment.
Myth or fact?
Summary
- The upper third runs from the hairline to the glabella and is compared with the other two thirds.
- Pulled-back hair, recession and a tilted photo distort forehead height.
- The frontalis holds up the eyebrow: assess in movement before planning.
- Injectables do not change forehead height or the hairline.
- Record the forehead at rest, raising the eyebrows and frowning.
Frequently asked questions
What is the ideal forehead height?
There is no single height. The upper third is usually compared with the other two thirds of the face, but a harmonious forehead depends on the proportions of the face and the patient's identity.
Does the hairline change the HOF plan?
Yes. A high forehead or receding hairline changes how the frontal lines are read and the risk of the eyebrow dropping after toxin, and it influences the choice of what to treat.
Can I treat the forehead if the patient has a low forehead and heavy eyebrows?
With great caution. In these cases, the frontalis is usually compensating, and weakening it can weigh down the gaze. Assessment in movement is mandatory.
How do I record the forehead in the planning photo?
With the hair pulled back, the head level and a neutral expression, so you can see the hairline, the forehead height and the eyebrow position without interference.
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.