Last Updated February 10, 2026 – Frown lines appear between your eyebrows when you squint or concentrate. These vertical lines are also called glabellar lines or “11s” because of how they look. They form when small muscles in your forehead contract over and over. At first, the lines only show when you move your face. Over time, they can become permanent creases that stay even when your face is relaxed.
Key Takeaways
- Frown lines, or “11s,” start as movement lines and can become permanent creases over time.
- Dynamic lines respond best to early muscle relaxation, while static lines may need added skin treatments.
- Botulinum toxin type A is the standard first choice, with results in 2 to 7 days and peak at 2 to 4 weeks.
- Filler is usually avoided between the brows due to higher risks in this blood vessel rich area.
- Zest Clinic tailors injection points and dose for natural movement, with simple aftercare and a 2 week review option.
Dynamic vs Static Lines: Why It Matters
Dynamic lines appear only during muscle movement. When you stop frowning, they disappear. Static lines are etched into your skin and stay visible all the time.
Treating dynamic lines early gives the smoothest results. The standard approach uses botulinum toxin type A to relax the muscles that create frown lines.1 This stops the repeated movement that deepens creases.
Static lines that have set in may need additional treatments after the muscle relaxes. Skin quality procedures or resurfacing can help soften these etched creases.
Common Treatments
Botulinum Toxin Type A
This treatment works by relaxing the muscles between your eyebrows. Your doctor injects small amounts into specific points around the glabella area. The classic pattern uses five injection points, but your doctor will adjust this based on how your muscles move and where your brows sit.
Results start showing in two to seven days. The effect reaches its peak around two to four weeks. Most people see results last three to four months on average. Some studies show that higher doses can extend how long results last, but dosing stays personal based on your needs and safety.
Why Filler Isn’t Used Here
The area between your eyebrows has important blood vessels running through it. Filler injections in this zone carry serious risks. Cases of skin damage and even vision loss have been reported when filler blocks these vessels.2
Most medical guidelines say to avoid glabellar filler except in rare cases with very experienced injectors. Sometimes HA filler is used to correct the deep static lines. Botulinum toxin is the safer first choice for frown lines.
Help for Etched Lines
After the muscle relaxes, you might still see some fine creases in the skin. Skinboosters and other skin quality treatments can improve these leftover lines. These work on the skin itself rather than the muscle underneath.
What to Expect at Zest Clinic
Your consultation starts with checking how your frown muscles work. Your doctor looks at your brow position, skin type, and medical history. They map out where to place injections based on your unique muscle patterns.
The procedure takes just minutes. You get tiny injections in the treatment area. Most people feel only mild discomfort.
After treatment, stay upright for three to four hours. Don’t rub or massage the area for about 12 hours. Skip hard exercise for roughly 24 hours. These steps help the treatment settle properly and reduce bruising. You can usually return to work the same day.
An optional review visit around two weeks later lets your doctor check results and make small adjustments if needed.
The result is a natural looking facial movement and expression. The dose and injection technique used determines the degree of muscle relaxation and movement. At Zest Clinic, we focus on natural looking and minimally restricted facial muscle movements.
Safety and Side Effects
Mild redness and small bruises are common. Some people get a temporary headache. These effects go away quickly.
Eyebrow or eyelid drooping can happen but is uncommon. Careful mapping and experienced injection technique lower this risk.
You should avoid this treatment if you’re pregnant, breastfeeding, have certain nerve or muscle conditions, or have an active skin infection in the treatment area.
Why Our Page Looks This Way
Singapore has strict rules about medical advertising. We can’t name prescription medicine brands on public pages or show before-and-after photos in our marketing. Your doctor can show you these images during your private consultation with full context and explanation.
These rules protect patients by making sure medical treatments are discussed properly with a qualified doctor first.
