Botox · Jaw slimming

Jaw Botox (Masseter Botox) in Myeongdong, Seoul

A square lower face is often muscle, not fat or bone. Jaw Botox relaxes an enlarged masseter so the jaw looks softer and slimmer over a few weeks, with no downtime.

Slim, defined jawline representing jaw Botox at Obliv Clinic Seoul Origin

Quick answer

Jaw Botox is botulinum toxin injected into the masseter, the chewing muscle at the angle of the jaw. When an enlarged masseter makes the lower face look square, relaxing it lets the muscle shrink, giving a slimmer, more oval jawline. At Obliv Clinic Seoul Origin a doctor checks how much of your width is muscle before treating. Injection takes about 10 minutes, slimming shows over 2–6 weeks and typically lasts 4–6 months.

TimeAbout 10 minutes
DowntimeNone
ResultsVisible in 2–6 weeks
Lasts4–6 months

What is jaw Botox?

The masseter runs from the cheekbone to the angle of the jaw. People who clench, grind or chew a lot often develop a thick masseter that widens the lower face. A measured dose of botulinum toxin reduces how strongly the muscle contracts; because it is used less, it gradually becomes thinner, much like any muscle that is rested.

This is why jaw Botox works slowly. Wrinkle Botox shows in days, but the masseter needs weeks to reduce in size. Many patients also notice less morning jaw tension, which is why the same treatment is used for teeth grinding.

Who is it for?

  • A square or wide lower face where the muscle bulges when you clench.
  • People who clench or grind and want a softer V-line at the same time.
  • Not ideal when width comes mainly from jowl fat or bone; ONDA, fat-dissolving injections or jawline filler may suit better.
  • Not during pregnancy or breastfeeding, or with neuromuscular disorders.
Jaw Botox slimming timeline Day 0 a 10-minute injection; week 2 slimming begins; week 4 visible softening of the jaw angle; week 6 full effect; months 4 to 6 plan the next session. JAW BOTOX · MASSETER SLIMMING TIMELINE Day 0 10-minute injection no downtime Week 2 Slimming begins, chewing feels lighter Week 4 Visible softening of the jaw angle Week 6 Full effect; review by photo Month 4–6 Plan the next session; results build with repeats Schematic. Timing varies with muscle size, dose and chewing habits.
How jaw Botox slims the lower face, week by week.

How Obliv plans jaw Botox

Your doctor feels the masseter while you clench and relax, checks for asymmetry and asks about grinding, chewing gum and diet. Points are placed in the lower, safe part of the muscle and kept away from the smile muscles at the front, which protects your expression. Doses are recorded per side in your Skin Library, so the next session can be adjusted rather than repeated blindly.

Typical dose Often 20–30 units per side (onabotulinumtoxinA equivalent); stronger muscles may need more. Your doctor confirms units in writing.
Technique 3–5 points per side in the lower masseter
Pairs well with Face slimming, shoulder Botox, chin filler
Review At 4–6 weeks, by photo on WhatsApp if you have flown home

Results and recovery

There is no downtime and you can sightsee straight away. Chewing may feel weaker for a few weeks, mainly with tough or chewy food. Slimming builds between weeks 2 and 6; repeat sessions every 4–6 months often give a longer-lasting result because the muscle stays smaller.

Risks and side effects

  • Temporary chewing fatigue.
  • Small bruises at injection points.
  • Rarely, an uneven smile if product spreads forward; this fades as the effect wears off.
  • With very high or frequent dosing, a hollow look below the cheekbone; we dose conservatively to avoid it.

Aftercare

  • Do not massage the jaw or use face rollers for 24 hours.
  • Skip saunas, jjimjilbang and hard exercise on the day.
  • Prefer softer foods for the first days if chewing feels tired.

Botox by area

Every area has its own muscles, doses and risks. Choose an area for a doctor-reviewed guide, or read the Botox overview and our comparison with Xeomin.

Looking for volume rather than relaxation? See dermal fillers by area, or meet the doctors who plan every dose.

Ask a doctor about Botox

Send a photo and your travel dates on WhatsApp (+82-10-3086-4084). English replies, a personal plan and a written quote before you fly.

Frequently asked questions

How long does jaw Botox take to work?

Most people see slimming from about 2 weeks, with the full effect between 4 and 6 weeks, because the muscle needs time to reduce in size.

How long does jaw Botox last?

Usually 4–6 months. After several sessions the muscle often stays smaller for longer, so intervals can be stretched.

How many units do I need for jaw Botox?

Often 20–30 units per side in onabotulinumtoxinA terms, depending on muscle size and strength. Your doctor confirms the exact units in your written plan.

Will jaw Botox change my smile?

Not when it is placed correctly. Injecting the lower masseter and staying clear of the smile muscles keeps your expression natural.

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Medically reviewed by the Obliv Clinic Seoul Origin medical team
Last reviewed 2026-10-29. General information, not a diagnosis; your plan is set after an in-person consultation.