Horizontal forehead lines carry a complication most facial lines do not. The muscle that creates them is also the only muscle lifting your eyebrows, so relaxing it enough to smooth the lines reduces how much it lifts. That tension is the whole story of treating this area, and it explains the most common complaint patients bring from a previous injector.
Sam Assassa, MD has served as Founder and President of the American Association of Aesthetic Medicine and Surgery since 2006 and is a certified educator for the International Academy of Aesthetics. He founded Beverly Hills Aesthetics in 1995 and is board certified in Internal Medicine. Dr. Assassa has performed more than 25,000 procedures across both the cosmetic and functional applications of botulinum toxin. He is a contributor to PRIME Journal: Plastic and Reconstructive Aesthetic Medicine and has directed hands-on training courses for physicians in more than 15 countries.
What Causes Forehead Lines
The frontalis is a broad flat muscle across the forehead, and its only action is raising the brows. Every time you look surprised, raise your eyebrows for emphasis, or lift your brows to open your eyes wider, it contracts and the skin above folds.
Over decades that folding etches horizontal lines. They deepen faster in people who are naturally expressive, and faster still in people who unconsciously raise their brows to compensate for heaviness in the upper eyelid, which becomes a cycle.
Sun damage and collagen loss deepen them further by reducing the skin’s ability to recover from each fold.
Why the Brow Drops
This is worth understanding before any treatment.
Several small muscles pull the brow downward and the frontalis pulls it up. Brow position is the balance between them. If the frontalis is relaxed broadly to smooth forehead lines, the downward muscles are unopposed and the brow settles lower, producing a heavy or hooded feeling.
The lines are gone and the eyes feel smaller. That is not a product failure, it is a placement decision, and it is avoidable.
Patients who compensate for existing brow heaviness by holding their brows up are the most likely to notice it, because the frontalis was doing more work than they realised.
Lines at Rest Versus Lines in Motion
If your forehead lines only appear when you raise your brows, relaxing the muscle prevents them deepening and they largely disappear.
If they are visible with your face completely still, the skin has creased and muscle treatment softens them without erasing them. Those need the skin treated as well.
How Forehead Lines Are Treated
- Botox® for forehead lines relaxes the frontalis selectively, preserving enough lift to avoid heaviness. This is an FDA approved indication, at an approved dose of 20 units.
- Brow lift treatment relaxes the downward pullers instead, which can be combined so the brow holds position while the lines soften.
- Resurfacing for lines already etched into the skin.
- Forehead contouring where the forehead has also flattened, since restoring shape changes how light falls across the lines.
Book Your Consult for Forehead Wrinkles in Beverly Hills
Dr. Assassa will assess how much of your brow position depends on the frontalis before treating it, which is what prevents the heaviness patients most often complain about. Request a consultation or schedule your appointment online.