Korean Jaw Botox in Busan: Face Slimming Guide

October 25, 2026

Jaw Botox is the treatment behind much of the “V-line” or small-face look that Korea is known for. By relaxing the large chewing muscle at the back of the jaw, it can soften a square lower face without surgery. For visitors to Busan it is quick and has no downtime, but results take weeks to appear, so timing matters. This guide explains how it works, who it suits, how it compares with fat-dissolving injections, and what it costs.

Quick answer: Jaw Botox places botulinum toxin into the masseter, the chewing muscle at the angle of the jaw. As the muscle relaxes, it gradually shrinks in bulk, giving a slimmer, softer lower face. Injections take about 5–10 minutes with no numbing or downtime, slimming develops over about 4–8 weeks, and results usually last around 4–6 months. It works when width comes from muscle, not fat, so many Korean plans pair it with a contouring injection. In Seomyeon, packages combining masseter Botox with a contouring injection start from KRW 99,000 before 10% VAT, and a first-visit trial of 50U is listed at KRW 9,900.

How jaw Botox slims the face

The masseter is a strong muscle you can feel at the back of your jaw when you clench. In some people it is naturally large, or it grows bigger from habits such as teeth grinding, clenching or frequent gum chewing, which makes the lower face look square.

Botulinum toxin temporarily blocks the nerve signal that makes the muscle contract. A muscle that is used less gradually loses bulk, a bit like any muscle you stop training. The face looks slimmer at the jaw angle over the following weeks. As the effect wears off, the muscle can slowly regain bulk, so treatment is repeated.

Is your wide jaw muscle, fat or bone?

  • Muscle: the jaw angle feels firm and bulges when you clench. Jaw Botox targets this directly.
  • Fat: soft fullness in the cheeks, jowls or under the chin. A fat-dissolving contour injection is more suitable.
  • Bone: a wide jaw structure. Botox and injections cannot change bone.
  • Skin laxity: sagging along the jawline. Lifting devices such as HIFU may help more.

Many faces have more than one cause, which is why the doctor feels the muscle while you clench before deciding the plan.

The Korean “small face” approach

In Korea, jaw slimming is often planned as more than one area:

  • Masseter: the main muscle at the jaw angle.
  • Temporalis: a muscle at the temples that can make the upper side of the face look wide.
  • Parotid gland area: in front of the ear, which can add fullness to the side of the face.
  • Contouring injection: a fat-dissolving solution for cheek fat or puffiness.

Combining treats fat and muscle together, so one part is not slimmed while the other stays wide.

How much does jaw Botox cost in Busan?

Examples from a clinic in Seomyeon:

  • Korean jaw Botox 50U : KRW 9,900 (first-visit single-session trial; ask about availability)
  • Jaw Botox + contouring injection 18cc : from KRW 99,000
  • Small-face contouring injection (temporalis, parotid glands and jaw angles) : from KRW 149,000

Prices checked October 2026. They are in Korean won and exclude 10% VAT, which is added at payment. Trial offers and prices can change or end at any time, so confirm on WhatsApp when you book. Imported toxin brands are priced by dose on request.

How many units?

The dose depends on the size and strength of your masseter and is decided at the consultation. 50U is a common starting point for both sides. Men, people who grind their teeth or chew gum often may have larger muscles and need a different plan. Later doses are adjusted to how you responded and may decrease as the muscle becomes smaller.

What happens on the day

  1. Message first with front and side photos, ideally one relaxed and one clenching, plus your travel dates and previous toxin treatments.
  2. Consultation. The doctor feels the masseter while you clench, checks both sides and reviews your health and medicines.
  3. Injection. No numbing is usually needed. A few injections into each masseter take about 5–10 minutes.
  4. Back to your day. There is no downtime.

Results timeline

  • Week 1–2: the muscle relaxes; clenching feels weaker but the face looks the same.
  • Weeks 4–8: slimming becomes visible as the masseter reduces.
  • Months 4–6: bulk slowly returns; a repeat maintains the result.

Do not judge the result after a few days. Taking front photos before treatment helps you see the change.

Side effects and safety

Jaw Botox is generally well tolerated when performed by a doctor. Common effects include small bumps or bruising at injection points and mild chewing fatigue for a few weeks, especially with tough or chewy foods. Less commonly, an uneven smile or asymmetry can occur if the toxin affects nearby muscles; this fades as the effect wears off. Overly high doses can make the cheeks look hollow in some people, which is one reason doses are adjusted gradually.

Jaw Botox is not suitable during pregnancy or breastfeeding, with a neuromuscular disorder such as myasthenia gravis, an infection at the injection site or an allergy to any ingredient. If you grind your teeth, mention it; masseter Botox is sometimes used to reduce clenching, but a dentist should also assess grinding.

Aftercare and planning around a trip

  • Stay upright and do not rub or massage the jaw for 3–4 hours.
  • Skip saunas and jjimjilbang, hot baths, hard exercise and alcohol on the day.
  • Flying is generally fine; tell the doctor your flight date.

Because slimming takes 4–8 weeks, you will usually see the full result at home rather than during your trip. For a wedding or photoshoot, have jaw Botox about 4–8 weeks beforehand. If you want an early check for symmetry, book early in your stay and message the clinic at about two weeks.

Frequently asked questions

Will jaw Botox affect my chewing?

You may notice mild chewing fatigue for a few weeks. Doses aim to reduce bulk without weakening your bite too much.

Does the jaw become permanently slimmer?

Not permanently, but with repeated treatment the muscle often stays smaller and doses can sometimes be reduced.

Jaw Botox or contour injection?

Botox slims muscle; a contour injection reduces fat. If both contribute to width, combining them is common.

Wondering whether your jaw width is muscle or fat?
Send a front and side photo, relaxed and clenching, with your travel dates on WhatsApp to get a plan and today’s price in English.

This article is for general information and does not replace a medical consultation. Suitability, results, recovery and side effects vary from person to person.

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