Short answer:
Jaw Botox relaxes the masseter muscles so they gradually shrink. Chewing may feel weaker within a few days, the jaw angle starts to look softer after 2–4 weeks, and maximum slimming usually shows at 6–8 weeks. Results last about 4–6 months, and many people need less frequent top-ups after several sessions. In Gangnam it typically costs ₩50,000–₩250,000 (about $40–$180).
Why jaw Botox slims the face
The masseter is the thick chewing muscle at the angle of the jaw. When it is enlarged, often from clenching, grinding, chewing gum or simply genetics, the lower face looks square or wide. Botulinum toxin blocks the signal from the nerve to the muscle, so the muscle works less and slowly loses bulk, much like an unused muscle anywhere in the body.
The bone does not change. That is why results depend on how much of the width actually comes from muscle. A doctor checks this by feeling the muscle while you clench. See our jaw Botox guide.
Week-by-week timeline
Days 2 to 7
The toxin starts working. Chewing tough food such as dried squid or steak may feel tiring, and some people notice less clenching at night.
Weeks 2 to 4
The muscle begins to shrink and the jaw angle looks softer in photos.
Weeks 6 to 8
Maximum slimming is usually visible. This is a good time for comparison photos.
Months 4 to 6
Nerve signalling recovers and the muscle gradually rebuilds. Many people book their next session at this point.
After several sessions
With regular treatment, the muscle may stay smaller and some people can space sessions to every 6–9 months.
Who is a good candidate
- People with visibly bulky masseters when clenching.
- Those who clench or grind their teeth.
- Anyone wanting a softer, more oval lower face without surgery.
If the width comes mainly from bone, fat or sagging skin, jaw Botox alone will disappoint. A combined non-surgical V-line plan
or, for bone, surgery
may suit better.
How the treatment is done
- The doctor marks the muscle while you clench.
- Several injections are placed into the lower part of each masseter, avoiding the smile muscles.
- The treatment takes about 5–10 minutes with little or no numbing needed.
- You can return to normal activities immediately.
Doses and toxin brands
Doses vary by muscle size, sex and brand. Korean toxins such as Botulax and Nabota are commonly used in Gangnam and are cheaper than imported brands such as Botox (Allergan) or Xeomin. Ask which brand and how many units you will receive. Read toxin brands compared.
Side effects
- Temporary chewing fatigue for 2–4 weeks.
- Small bruises at injection points.
- Rarely, an uneven smile if the toxin spreads to nearby muscles.
- With repeated high doses, a slight hollow above the jaw in some people.
Serious side effects are rare when injections are placed correctly.
Jaw Botox price in Gangnam (2026)
Typical prices run ₩50,000–₩250,000 (about $40–$180), with many quotes near ₩150,000. In the US, masseter Botox commonly costs $500–$1,000, so Gangnam is often around 85% less. Combining jaw Botox with skin botox
or Shurink is a popular package. See the jaw Botox cost guide.
Aftercare
- Avoid massaging the jaw for the rest of the day.
- Skip saunas and intense exercise on the day of treatment.
- Avoid chewing gum and very tough foods for the first couple of weeks if you want to support the effect.
Frequently asked questions
How soon will my face look slimmer?
Usually after 2–4 weeks, with the full effect at 6–8 weeks.
How long does jaw Botox last?
About 4–6 months.
Does it help teeth grinding?
It can reduce clenching and grinding symptoms; discuss this with your doctor.
Can I fly after jaw Botox?
Yes, usually the next day.
Will my face sag after stopping?
The muscle simply returns to its previous size; there is no evidence it causes sagging.
How much does it cost in Gangnam?
Typically ₩50,000–₩250,000 in 2026.
This article is general information, not medical advice. Suitability, settings and results vary by person. Always consult a licensed doctor and get an itemised written quote before treatment. Prices are typical 2026 Gangnam planning ranges at about 1 USD = ₩1,400 and change often. Updated October 2026.
