Facial Slimming Injections in Seoul: Jaw Botox and V-Line
The short answer
Facial slimming injections narrow the lower face by relaxing an enlarged masseter muscle with botulinum toxin or by dissolving small pockets of fat. Masseter Botox in Gangnam typically costs ₩50,000–₩400,000 depending on the toxin brand, takes about ten minutes, has no downtime and shows slimming after two to six weeks. Results last roughly four to six months.
Key facts
- Two types: masseter Botox (muscle) and fat-dissolving injections (fat)
- Procedure time: about 10–20 minutes
- Downtime: none for Botox; 2–5 days swelling for fat injections
- Results appear: 2–6 weeks for Botox
- Results last: about 4–6 months for Botox
- Typical Seoul price: ₩50,000–₩400,000 for masseter Botox
Muscle or fat: why the cause matters
A wide lower face can come from three sources: a strong masseter muscle, fat along the jaw and cheeks, or bone structure. Injections can address the first two. Before treatment, a doctor will feel the jaw while you clench, look at your profile and decide whether muscle, fat or both are responsible.
This step matters because masseter Botox does nothing for fat, and fat-dissolving injections do nothing for muscle. Many patients benefit from a combination.
Masseter Botox
Botulinum toxin is injected into several points of each masseter, the chewing muscle at the angle of the jaw. The muscle relaxes and gradually shrinks from reduced use, which creates a softer, more tapered V-line. It can also help people who clench or grind their teeth.
- Takes about ten minutes
- Slimming begins after two weeks and peaks at four to six weeks
- Lasts about four to six months; repeated treatment may extend this
Seoul clinics offer both Korean toxin brands and imported ones such as Botox or Xeomin. Korean brands are usually much cheaper; ask which product and how many units you will receive. Our botulinum toxin injection page explains brand differences.
Fat-dissolving injections
For softness along the jawline, cheeks or under the chin, fat-dissolving solutions break down fat cells, which the body then removes. Expect swelling for two to five days and two to four sessions for a visible change. Read our injection lipolysis guide for details.
| Feature | Masseter Botox | Fat-dissolving injections |
|---|---|---|
| Targets | Muscle bulk | Localised fat |
| Sessions | 1, repeated every 4–6 months | 2–4 |
| Downtime | None | 2–5 days swelling |
| Results last | 4–6 months | Long-term if weight is stable |
Who is a good candidate?
Masseter Botox suits people with a square jaw from muscle, often noticeable when clenching. Fat-dissolving injections suit mild fullness that you can pinch. If your width comes mainly from bone, injections will make only a small difference, and facial contouring surgery is a separate discussion.
Side effects
Botox may cause mild tenderness, a temporary change in chewing strength, or, if too much is used, a slight hollowing below the cheekbone. Experienced injectors reduce these risks by adjusting dose and placement. Fat injections cause swelling, bruising and occasional lumps that settle.
Planning around travel
Masseter Botox is easy to fit into any trip: no downtime and no restriction on flying. Because the slimming effect appears after you return home, take front and side photos beforehand. If you are combining it with tightening for the jawline, see our jawline tightening page.
Questions to ask
- Is my width mainly muscle, fat or bone?
- Which toxin brand and how many units per side?
- Will the doctor perform the injections personally?
- When should I repeat treatment?
This guide is for general information and is not medical advice. Prices are typical ranges reported by Gangnam clinics in 2026 and vary by clinic, doctor and treatment plan; confirm directly with the clinic.
Patient questions
Frequently asked questions
How soon will my face look slimmer?
Masseter Botox usually shows a change at two to three weeks, with the full effect at four to six weeks.
Does jaw Botox affect chewing?
Some people notice slightly weaker chewing for a few weeks. It rarely interferes with normal eating.
Is Korean toxin as effective as imported Botox?
Korean brands are widely used and approved in Korea. Effects are similar for most patients, but ask about the brand and dose.
Can I combine jaw Botox with other treatments?
Yes. It is often combined with HIFU, fillers or fat-dissolving injections in the same visit.
Not sure which Gangnam clinic is right for you?
Tell us your goals, budget and travel dates. Our English-speaking coordinators compare doctor-led clinics and usually reply with free quotes within 24 hours.