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Jaw Botox in Korea: Units, Results and How Long It Lasts (2026)
By Dr. IM JUNHYUNG · Updated
- The muscle softens within days; the slimming shows over two to four weeks and peaks at around six to eight.
- Results usually last four to six months; regular repeats can keep the muscle smaller for longer.
- Coretox, Xeomin and Allergan are all available; the brand and units go on your record.
- Back to normal the same day. Chewing can feel tired for a week or two.
- Session
- About 10 min
- Discomfort
- 1 / 5
- Visible change
- 2–4 weeks — slimming builds
- Lasts
- 4–6 months — varies
Muscle, bone or fat?
A square-looking lower face has three common causes: a strong masseter, a wide jawbone, or fullness under the jaw. Clench your teeth and press the angle of the jaw: if a firm bulge pushes out, muscle is part of it. Botox only changes muscle. Bone does not respond, and fat under the jaw needs a different approach.
How units are planned
We feel and watch the muscle at rest and clenched, and usually find one side larger — often the side you chew on. Units are set per side and placed at several points within the muscle, keeping clear of the area near the mouth corners.
The brand and units for each side go on your record card. That matters if you continue treatment back home: the next doctor can start from your actual numbers.
When it shows and how long it lasts
| Time after treatment | What you may notice |
|---|---|
| 1–2 weeks | Chewing feels weaker; muscle softer to touch |
| 2–4 weeks | Lower face starts to look slimmer |
| 6–8 weeks | Change at its most visible |
| 4–6 months | Muscle gradually returns; time to review |
People who repeat it regularly often find the muscle stays smaller between sessions. We set the interval at review rather than on a fixed calendar.
Choosing a brand
Coretox, Xeomin and Allergan are all botulinum toxin type A. They differ in formulation and price, and units are set per product. For most people the doctor’s planning matters more than the label. If you have had many treatments over the years, ask about products made without accessory proteins — the theory is a lower chance of antibodies, though evidence is limited.
Side effects and aftercare
Back to normal the same day. Small bruises at injection points can occur. Chewing may feel tired for a week or two, especially with tough food. Rarely, a smile can look uneven if toxin spreads to nearby muscles; it settles as the effect wears off. Don’t massage the area on the day, and skip saunas, alcohol and heavy exercise for the rest of the day.
FAQ
How many units is jaw Botox?
It depends on the muscle size on each side and the product. We set units per side after examining the muscle and write them on your record.
When will my face look slimmer?
Usually from two to four weeks, with the most visible change at around six to eight weeks.
Will jaw Botox make my cheeks sag?
Not when the dose suits the muscle. Over-treating a small muscle or an older face with thin skin can make the area look hollow, so we keep doses conservative.
Which brand should I choose for jaw Botox?
There is no single right answer. Coretox, Xeomin and Allergan all work; they differ in formulation and price. We help you choose at consultation.
General information, not medical advice. Your plan is set at an in-person consultation; results vary by individual.
Representative Director of Taut Clinic, Gangnam. Full member of the Korean Aesthetic Surgery & Laser Society (ASLS), the Korean Association for Laser Dermatology and Trichology (KALDAT) and the Korean Society of Filler Medicine. Commendation from the Minister of Health and Welfare.
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