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Face
Bone Isn’t The Muscle.
Square jaw reduction surgery in Korea cuts bone, not muscle. Angle, V-line and cheekbone reduction compared, nerve risk, the stay, and how cost is quoted.
The jaw you see in a photo is three things stacked on top of each other. Bone, muscle, and fat. Only one of them needs a saw.
In Seoul the same consult is sold under five names: jaw reduction, square jaw surgery, jawline shave, V-line, facial contouring. A Kakao chat sends a price tile for "V-line." Nobody in the chat has seen your CT. The coordinator asks for a deposit before a surgeon has said which bone is wide, or whether bone is the problem at all.
If you remember one test, remember this. Clench your teeth in a mirror and feel the corner of your jaw. If a firm block rises under your fingers, muscle is a big part of the width, and the surgery alone may not give you the photo you want. If nothing moves and the corner stays sharp, it is more likely bone, and that is the conversation this guide is about.
Often both, which is why the order of appointments matters. The chewing muscle, the masseter, sits on the outside of the jaw angle. When it is thick, toxin can thin it over weeks. One Korean series found the muscle about 31% thinner at three months after toxin, and the authors treated muscle bulk and bone as separate problems.5 That appointment has its own guide: jaw Botox is not a jawline. Fat under the chin is a third problem with its own tools, covered in our fat-dissolving injection guide.
Bone is what is left when the muscle relaxes. A prominent jaw angle flares out below the ear. A broad chin makes the lower face read square from the front. Wide cheekbones widen the middle of the face and can make a narrow jaw look heavier. Each of these is a different cut.
A surgeon tells them apart with your face in the room and a scan on the screen. The published Korean series plan the bone cuts on panoramic X-rays and 3D CT, then measure the change on follow-up scans.1, 2 A photo on WhatsApp can start the conversation. It cannot finish it.
They are different operations that are often sold together. Mandible angle reduction cuts the flared corner below the ear. A "V-line" usually means the cut is carried forward along the lower border toward the chin, sometimes with the outer layer of bone shaved, so the face narrows from the front as well as the side.2 Genioplasty moves or narrows the chin itself. Zygoma reduction, also called reduction malarplasty, cuts and repositions the cheekbone and its arch.1, 3
Most of the work happens through the mouth, so the scars are usually inside. Cheekbone reduction may add a small incision near the ear.1 All of it is done under general anesthesia.1, 2
The table below sets out what each operation targets and what published Korean data say about its most common problems. These are single case series and one pooled analysis, not a promise for your surgeon or your face.
| Operation | What it changes | What it does not change | Numbers from the published literature |
|---|---|---|---|
| Mandible angle reduction (often with outer cortex shaving) | Flared jaw corner, side profile | Masseter muscle bulk, chin fat, loose skin | 588 patients, one surgeon: numbness of chin, lip or gum in 6.46%, lasting past a year in 1.53%; infection in 3.23% within two weeks1 |
| V-line (long curved cut from angle toward chin) | Lower-face width from the front and side | Cheek width, skin quality | 243 patients: temporary lip and chin numbness in 6.2%, settled in 3–6 months; limited mouth opening 3.3% (resolved within three weeks); soft-tissue sagging 4.5%2 |
| Genioplasty (chin narrowing or sliding) | Chin width, length, projection | Jaw angle | Numbness was more frequent in the patients who also had chin surgery1 |
| Zygoma reduction (reduction malarplasty) | Cheekbone body and arch, mid-face width | Lower jaw | 14 studies, 3,149 cases: temporary numbness 5.8%, cheek drooping 2.8%, bone not knitting 2.2%, asymmetry 1.8%, facial nerve injury 0.9%3 |
Rates come from cited case series and a meta-analysis (data published 2014–2017). They describe those patients, not a forecast. Not a Peep recommendation.
Two lines in that table get skipped in chats. Numbness is common enough to hear about in the consult, and the long-lasting kind should be a named risk on your consent form. Sagging is the quieter one. Take bone away and the soft tissue on it has less to hang from.2, 3
Plan around the surgeon's checks, not the flight deal. In the large Korean series, patients spent one to two days in the clinic after surgery and wore a bulky compression dressing for three to five days, followed by an elastic face mask.1, 2 A drain, when used, stayed about a day.2 Follow-up in the 588-patient series averaged fourteen weeks, which is longer than any vacation, so ask how the clinic will see you after you leave.1
The American Society of Plastic Surgeons suggests waiting about seven to ten days after facial surgery before a long flight, because surgery and long flights each raise the risk of blood clots.4 Bone surgery under general anesthesia sits at the serious end of that range. Ask your surgeon for their window and book the return after it, not before.
The days are ordinary and slow. Swelling peaks early and fades over weeks. Food is soft at first, because the incisions are inside your mouth. In one series a few patients could not open fully for up to three weeks.2 Lip or chin numbness may fade over months.1, 2 You fly home in the middle of the story.
Seoul jaw quotes are priced by bone: angle, chin or cheekbones. Anesthesia, CT scans, clinic nights and follow-ups are extra. As of October 2026, the VAT refund for foreign visitors' cosmetic procedures has ended; it covered treatment received by 31 December 2025.6, 7 Korean clinics must post non-covered fees, list them on any site they run, and never take more.8, 9
Bills that would restore the VAT refund are pending in the National Assembly, but none had passed when we checked on 21 October 2026.10 We could not find a dated, non-clinic source for Korean jaw-surgery prices, so this guide prints no ranges. What we can tell you is how the quote is built, so two quotes can be read side by side.
Count the bones first. Angle only, angle plus chin, or angle plus chin plus cheekbones are different operations with different operating times, and the published series report them as separate groups.1 A "V-line package" price that does not say which cuts are inside it is not a price yet.
Then the lines around it. Who gives the general anesthesia and whether a dedicated anesthesiologist stays in the room. The CT scans, pre-op and post-op. Nights in the clinic. Compression garments, drains, medicines, stitch checks. Follow-up visits, and what happens if you need one from abroad. Revision terms, in writing. Our plastic surgery cost guide walks through a full quote line by line.
Ask whether VAT is inside the number before you compare it with a quote from 2025.
It will not thin a muscle. If clenching changes your jaw a lot, a bone cut leaves that bulk in place. The toxin research treats muscle bulk and bone as separate problems for exactly that reason.5
It will not tighten skin or remove fat. Taking bone away can make loose skin look looser, which is why sagging appears in the complication lists.2, 3 If your concern is a soft jowl or a fuller neck rather than a wide corner, ask whether a lift or a fat procedure is the real conversation. Our SMAS vs deep plane facelift guide explains the lift side.
It will not fix your bite. The 588-patient series only included patients whose teeth met normally.1 An underbite is a two-jaw, orthodontic question.
And it is not small. These are bone operations near the nerve that gives feeling to your lip and chin, done under general anesthesia. Ask who is operating, check their specialty, and request the operating-room camera recording if you want one. Our guide to whether plastic surgery in Korea is safe shows how to check all three from abroad.
Send this before any deposit:
A clinic that answers the first question before it sees a scan is guessing. A clinic that answers the last one in writing is planning.
Square jaw reduction surgery removes or reshapes part of the lower jawbone so the lower face looks narrower. In Korea it usually means cutting the flared jaw angle, often with shaving of the outer bone layer, through incisions inside the mouth under general anesthesia.1, 2 It treats bone, not the chewing muscle.
Not exactly. Jaw angle reduction trims the corner below the ear. V-line surgery in Korea usually carries the cut forward along the jaw toward the chin, and may include chin narrowing, so the face narrows from the front too.2 Ask the clinic to list which cuts the word "V-line" includes in your quote.
If the muscle is part of the width, many people try toxin first, because it is reversible and needs no anesthesia. One study found the masseter about 31% thinner at three months.5 It will not change bone. Our jaw Botox guide covers that appointment.
It is a real operation with known risks, done often in Korea. In one 588-patient series the most common problem was numbness (6.46%), with 1.53% still numb after a year, and infection occurred in 3.23% within two weeks.1 Safety depends on the surgeon, the anesthesia and the aftercare; see our safety guide.
A meta-analysis of 3,149 reduction malarplasty cases found temporary numbness in 5.8%, cheek drooping in 2.8%, bone that did not knit in 2.2%, asymmetry and limited mouth opening in 1.8% each, and facial nerve injury in 0.9%.3 Ask how the cut bone will be fixed in place.
Plan at least until your surgeon's main checks are done and you are past the window they set for flying. ASPS suggests about seven to ten days after facial surgery before a long flight.4 Book the return flight after the surgeon names the date.
Soft, cool food at first, because the incisions are inside the mouth and the jaw is stiff. Your clinic will give a diet sheet; follow it over anything online. Keep the mouth clean as instructed, since infection is one of the commonly reported problems.1
It depends on which bones are cut, the anesthesia, nights in the clinic, scans and follow-ups. We have not found a dated, non-clinic source for Korean price ranges, so this guide prints none. Ask for an itemized quote and compare it line by line using our cost guide.
No. Contouring surgery reshapes the outline of bone with the bite left as it is; the large Korean series included only patients whose teeth met normally.1 An underbite or crossbite needs an orthodontic and two-jaw surgery assessment, which is a different operation.
Anyone whose width is mainly muscle or fat, anyone with a bite problem that needs orthodontic care, and anyone who cannot stay long enough for the early checks. Smokers and people with bleeding or clotting problems need a frank talk first. A surgeon who says yes before seeing a scan has skipped a step.
Ask which bones they would cut, whether they reviewed a CT, who operates and their specialty, who gives anesthesia, how many nights you stay, when you can fly, and what happens if you are numb or uneven after you go home. Get the answers in writing before a deposit.
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This article is for general education and is not medical advice, a diagnosis, or a promise of outcome. It prints no prices because we found no dated, non-clinic source for Korean jaw-surgery ranges; ask the clinic for an itemized quote. Complication rates are quoted from published studies and describe those patients, not your result. Procedures are named to explain categories, not to endorse a clinic. If you have a bleeding or clotting disorder, a bite problem, or a medical condition that affects anesthesia, speak to a qualified clinician before facial bone surgery.
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