Jaw Botox vs Facial Contouring Injections: Face Slimming Comparison

October 25, 2026

A slimmer, V-shaped lower face is one of the most popular non-surgical goals in Korea, and visitors to Busan usually meet two options on clinic menus: jaw Botox and facial contouring injections. Both are quick injections with little downtime, but they work on completely different tissue. Picking the right one starts with understanding what is actually making your face look wide.

Quick answer: Jaw Botox relaxes the masseter, the chewing muscle at the angle of the jaw, so it gradually shrinks; it suits a square jaw that hardens when you clench, with results developing over 4–8 weeks and usually lasting 3–6 months. Facial contouring injections are fat-dissolving (lipolytic) injections placed into soft fat in the cheeks, jowls or under the chin, done as a course of about 3–5 sessions 1–2 weeks apart, with results that vary by person. If the width is muscle, Botox works better; if it is soft fat or puffiness, contouring injections fit; many faces have both, which is why the two are often combined.

Muscle, fat or bone? Finding the cause

Facial width usually comes from one or more of these:

  • Masseter muscle. Put your fingers on the angle of your jaw and clench your teeth. If a firm bulge pushes out, muscle is contributing. Teeth grinding, gum chewing and tough diets can enlarge it.
  • Soft fat. Fullness in the lower cheeks, jowls or under the chin that feels soft and can be pinched is fat.
  • Puffiness. Fluid retention, salty food, alcohol and poor sleep can make the face look fuller day to day.
  • Bone structure. A wide jawbone itself cannot be changed by injections.
  • Sagging. Loose skin and tissue that drops along the jawline can look like width; lifting treatments address this better.

How jaw Botox works

Botulinum toxin type A blocks the nerve signal that tells a muscle to contract. Injected into the masseter, it reduces the muscle's activity, and over several weeks the muscle becomes smaller from less use. The jawline looks softer and narrower from the front. Jaw Botox can also ease clenching and grinding for some people.

  • Treatment time: about 5–10 minutes, no numbing usually needed.
  • Results: slimming develops gradually over about 4–8 weeks.
  • How long it lasts: usually 3–6 months; repeated treatments may help the effect last longer.

How facial contouring injections work

Contouring injections are fat-dissolving solutions placed into the fat layer of specific areas. They aim to break down a small amount of local fat, which the body then clears, and some formulations also target puffiness. They are best for small, stubborn pockets of fat rather than large volumes, and they do not tighten loose skin.

  • Treatment time: about 5–10 minutes with no numbing.
  • Course: usually 3–5 sessions, 1–2 weeks apart.
  • Results: gradual slimming may be noticeable after 2–3 sessions and can be judged a few weeks after the last one. A stable weight helps it last.

It is worth being honest about evidence: the main fat-reducing ingredient approved in some countries (deoxycholic acid) has good data for under-chin fat, while many clinic formulations are blends whose results are less well studied and vary more between people.

Who suits which?

Jaw Botox may suit you if…

  • Your jaw feels hard and bulges when you clench.
  • Your face looks square from the front, especially at the jaw angles.
  • You clench or grind your teeth.

Contouring injections may suit you if…

  • You have soft fullness in the lower cheeks or a small double chin.
  • Your face looks puffy rather than square.
  • You can visit several times, 1–2 weeks apart.

Consider something else if…

Your lower face is sagging rather than full; lifting treatments or threads may help more. If your weight is changing a lot, or you are pregnant or breastfeeding, injections should wait. Very thin faces may look gaunt after slimming, so volume can matter more than reduction.

What it costs in Busan

Listed face-slimming packages at a clinic in Seomyeon include:

  • Jaw Botox + power contouring injection 18cc : from KRW 99,000
  • Small-face contouring injection (temporalis, parotid glands and jaw angles): from KRW 149,000
  • Shine Cut injection, 1 area (12cc) : from KRW 190,000
  • Shine Cut injection, full face (24cc) : from KRW 290,000

Prices checked October 2026. They are in Korean won and exclude 10% VAT, which is added at payment. Prices can change, so confirm the current price when you book. Several Botox brands are available, and the final price depends on the brand, dose and number of areas.

What happens on the day

  1. Consultation. The doctor feels the jaw while you clench, pinches the fat, and looks at your face from the front and side.
  2. Plan. Botox, a contouring injection or a combination is chosen, with the dose and areas.
  3. Injection. Both take about 5–10 minutes.
  4. After. You can return to sightseeing straight away.

Side effects and aftercare

  • Jaw Botox: small bumps that fade within an hour, occasional bruising, and for some people a temporary feeling of weaker chewing on tough food. Uneven smiles are uncommon and relate to placement.
  • Contouring injections: tenderness, warmth or mild swelling for a day or two.

For both, stay upright and avoid rubbing the area for 3–4 hours, and skip saunas and jjimjilbang, hot baths, hard exercise and alcohol on the day. Light makeup is usually fine later the same day.

Planning around a trip

Jaw Botox fits easily into any length of stay, but you will see the slimming after you get home, since it takes weeks. Contouring injections work best as a course, which is easier if you are staying in Busan for a few weeks or visit regularly; on a short trip, one session is a start rather than the full result. Flying is generally fine after both. Drink water and go easy on salty snacks on the plane to limit puffiness.

Frequently asked questions

Can I have jaw Botox and a contouring injection together?

Yes. Many faces have both muscle and fat contributing to width, so combining them in one visit is common, and several packages are designed this way.

Which works faster?

Neither is instant. Jaw Botox slims over about 4–8 weeks. Contouring injections show gradual change over a course of sessions.

Will jaw Botox affect my smile?

When placed correctly in the masseter, it should not change your smile. Tell the doctor about any previous jaw Botox and how it felt.

Want to know whether muscle or fat is widening your face?
Send a front and side photo and 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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