Jawline Slimming Injections in Seoul: Masseter Botox for a V-Line
Botox injected into enlarged masseter muscles to gradually slim a square or wide lower face — a quick, non-surgical V-line treatment.
Jawline slimming injections use botulinum toxin (Botox) to relax the masseter (chewing) muscles. As the muscle shrinks over several weeks, a square or wide lower face looks slimmer and more tapered; it can also ease clenching and grinding. The injection takes about 5 minutes (10–15 minutes per visit) and you can return to daily life immediately. First results appear in 2–4 weeks, the full effect at 6–8 weeks, and it lasts about 4–6 months.
What are jawline slimming injections?
The masseter is the muscle at the angle of the jaw used for chewing and clenching. When it is large — from genetics, clenching or grinding — the lower face can look square or wide. Small doses of botulinum toxin relax the masseter so it gradually decreases in size, making the lower face:
- Slimmer and softer
- More tapered, with a V-shaped outline
This only works when width comes from muscle. Width from fat or bone needs a different approach, such as fat-dissolving injections.
Who is a good candidate?
- Square or wide jawline due to prominent masseter muscles
- A heavy-looking lower face
- Jaw clenching or teeth grinding (bruxism)
- Men and women wanting a slimmer V-line without surgery
The doctor checks muscle size and symmetry by palpation while you clench, then adjusts the dose for each side.
Real result: Jawline / side-cheek volume (masseter & cheek filler)
What to expect
- Consultation in English to examine muscle size and face shape
- Customised dosing plan
- Injection takes about 5 minutes with minimal discomfort
- Return to daily life immediately
Total visit time is about 10–15 minutes. Some people notice temporary chewing fatigue with hard foods for a few weeks.
Results and duration
| Stage | Timing |
|---|---|
| First visible slimming | 2–4 weeks |
| Full effect | 6–8 weeks |
| Duration | About 4–6 months |
Regular repeat treatments can help maintain a slimmer contour over time.
Aftercare
- Avoid massaging or pressing the jaw for 24 hours
- No sauna or heavy workouts for one day
- Mild soreness or small bruises at injection points are normal and fade quickly
Reviewed by Dr. Joo Sohee
Representative director of Nest Clinic Gangnam, a doctor-led aesthetic clinic with a female medical team that treats local and international patients. This page is reviewed for medical accuracy; it is general information, not a diagnosis. Treatment plans are decided after an in-person consultation.
Clinic treatment counts as reported by Nest Clinic. About the clinic
Frequently asked questions
How long does masseter Botox take to work?
Slimming usually starts to show in 2–4 weeks, with the full effect at about 6–8 weeks.
How long do jawline slimming injections last?
About 4–6 months; regular treatment can help maintain the result.
Does jaw Botox help with teeth grinding?
It can reduce clenching and grinding by relaxing the masseter muscle, which is why some patients have it for both function and contour.
Will it affect my chewing?
Some people feel mild chewing fatigue with hard or chewy foods for a few weeks; normal eating is not affected.
Is there downtime?
No real downtime — most people return to work immediately. Small injection marks fade quickly.
Planning jaw slimming Botox in Seoul?
Send us a photo and your goals — a doctor reviews it and our English-speaking coordinator replies with a personalised plan and price.
4F–5F Seocho Building, 453 Gangnam-daero, Seocho-gu, Seoul
1-min walk from Sinnonhyeon Station Exit 7 (Line 9)
7–10 min from Gangnam Station Exit 10/11
+82-10-4843-2867
