Square Jaw & Face Slimming
Yaan Clinic · Gangnam, Seoul
A square jaw or wide lower face can come from enlarged chewing muscles, lower-face fat, a double chin or sagging. At Yaan Clinic in Gangnam, Seoul, doctors identify the cause first, then combine jawline Botox with Xeomin, the Tune Liner and fat-dissolving Double-Chin Package, lifting and threads for a slimmer, V-line look without surgery.
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A square jaw or wide lower face is a broad facial outline usually caused by enlarged masseter (chewing) muscles, lower-face fat, a double chin, sagging along the jawline, or bone structure. At Yaan Clinic in Gangnam, Seoul, non-surgical face slimming combines jawline Botox, fat-reduction treatments such as Tune Liner and fat-dissolving injections, lifting devices, threads and chin filler, matched to the cause after analysis.
The popular Korean "V-line" look is usually achieved by combining several of these, rather than one treatment alone.
What makes the lower face look wide or square?
The most common causes are overdeveloped masseter muscles from clenching or chewing, extra fat in the lower cheeks and under the chin, and loss of jawline definition from sagging. Wide jawbones also play a part, but bone can only be changed surgically.
- Masseter muscle – feels firm when you clench; common in people who grind their teeth or chew gum often.
- Lower-face and buccal fat – soft fullness in the lower cheeks.
- Double chin – fat under the chin that blurs the jaw-neck angle.
- Sagging and jowls – tissue dropping over the jawline, making it look heavier.
- Short or receding chin – a weak chin makes the lower face look wider by comparison.
Which non-surgical treatments slim the face?
Jawline Botox slims enlarged masseter muscles, fat-reduction treatments reduce lower-face and double-chin fat, lifting and threads sharpen a sagging jawline, and chin filler improves proportion. The right choice depends on what is making your face wide.
| Cause | Treatment at Yaan | How it helps |
|---|---|---|
| Enlarged masseter muscle | Jawline Botox (Xeomin) | Relaxes and gradually slims the chewing muscle |
| Double chin fat | Double-Chin Package(Tune Liner + fat-dissolving injection) | Ultrasound plus Yaan's in-house injection to reduce fat |
| Localized lower-face fat | Fat-dissolving injection, ONDA | Breaks down fat cells; microwave tightening and fat reduction |
| Fat plus laxity | Ulthera Fit, TuneFace | Lifting combined with Tune Liner for facial fat |
| Sagging jawline | Silhouette Soft thread lift | Repositions tissue and stimulates collagen |
| Short or weak chin | Chin filler | Lengthens and balances the lower face |
Yaan Clinic also lists TruSculpt, a heat-based device for facial contouring, among its equipment. For the full approach, see our non-surgical facial contouring page.
Does jawline Botox really slim the face?
Yes, when the width comes from an enlarged masseter muscle. Botox relaxes the muscle, which gradually becomes smaller, so the lower face looks slimmer over several weeks.
Yaan Clinic uses genuine Xeomin by MERZ in the correct dosage and is a MERZ Official Key Doctor clinic. Injection points and dose are set after analyzing your muscle. Jawline Botox will not reduce fat or change bone, so it is often combined with other treatments.
How is a double chin treated at Yaan Clinic?
Yaan Clinic's signature Double-Chin Package combines Tune Liner ultrasound with a fat-dissolving injection. It is listed at 600,000 KRW for one session and 1,500,000 KRW for three sessions, excluding VAT.
The injection formula is Yaan's in-house "Body Sculpture Injection", registered with the Korean Intellectual Property Office. A patented skin protector developed by Yaan's medical team is used to reduce irritation at injection points.
Good to know: Fat-reducing treatments in a slim face can cause hollowing if not planned carefully. Yaan Clinic adjusts energy and placement to keep volume where it is needed. Results vary and are not guaranteed.
How does Yaan Clinic work out what is making my face wide?
Your doctor feels the masseter while you clench, checks fat distribution and skin laxity, and looks at your chin and overall proportions. A 3D Meta-Vu analysis supports the skin assessment, and Yaan uses InBody analysis when planning body fat treatments.
This matters because each cause needs a different tool. Treating fat with Botox, or muscle with fat-dissolving injections, will not give the result you want, which is why Yaan builds a 1:1 plan rather than a fixed V-line menu.
What combinations create a V-line without surgery?
Most non-surgical V-line plans combine muscle slimming with fat reduction or lifting, and sometimes chin filler for proportion. Your doctor will confirm the combination after assessment.
- Jawline Botox plus Double-Chin Package – slims muscle and reduces under-chin fat.
- Ulthera Fit – Ultherapy Prime, Tune Liner and LDM for laxity with facial fat.
- Thread lift plus chin filler – defines a sagging jawline and balances a short chin.
If sagging is your main issue, read the sagging skin and jowls guide.
How much does face slimming cost at Yaan Clinic in Seoul?
At Yaan Clinic, jawline (masseter) Botox is ₩170,000 with Xeomin or ₩350,000 with Allergan. The Double-Chin Package is ₩600,000 for one session, and Silhouette Soft threads are ₩590,000 per thread.
| Treatment | Price at Yaan Clinic (KRW) |
|---|---|
| Jaw (masseter) / salivary gland / temporalis Botox | Xeomin ₩170,000 · Allergan ₩350,000 |
| Double-Chin Package (TuneLiner + fat-dissolving injection) | 1 session ₩600,000 · 3 sessions ₩1,500,000 (published Aug 2026, VAT excluded) |
| TuneFace | 40 kJ ₩700,000 · 60 kJ ₩900,000 · 80 kJ ₩1,100,000 |
| Silhouette Soft, 1 thread | ₩590,000 |
| Juvéderm Volux (nose, chin), 1cc | ₩590,000 |
These are Yaan Clinic's guide prices in KRW. International patients pay the same price as Korean patients, and your final price is confirmed at consultation. The consultation fee (₩10,000, or ₩30,000 with a director) is waived if you have a treatment. See jawline Botox price in Seoul, fat dissolving injection price, thread lift price and all treatment prices.
For international patients: Jawline Botox takes several weeks to show full slimming, so you will see the result at home; plan a repeat on a future trip. The Double-Chin Package is designed as a series, so ask how to space sessions around your travel. See the treatment trip planner.
Read how Yaan verifies genuine Xeomin and other products on our genuine products and safety page.
Frequently asked questions
How long does jawline Botox take to work?
Jawline Botox typically starts to relax the masseter within a couple of weeks, with visible slimming developing over several weeks as the muscle shrinks. Timing varies between people, and your doctor at Yaan Clinic will explain what to expect for your muscle size.
How long does jawline Botox last?
Results typically last several months, after which the muscle gradually regains strength. Repeated treatments can maintain the slimmer contour. Yaan Clinic does not publish a fixed duration, so your doctor will advise on a maintenance schedule.
Can I slim my face if my jaw is wide because of bone?
Non-surgical treatments cannot change bone. If width comes mainly from the jawbone, Botox, fat reduction or chin filler may improve balance, but the change will be limited. Your doctor will explain honestly what non-surgical options can achieve.
How much is the Double-Chin Package at Yaan Clinic?
Yaan Clinic's Double-Chin Package, combining Tune Liner and a fat-dissolving injection, is listed at 600,000 KRW for one session and 1,500,000 KRW for three sessions, excluding VAT. Jawline Botox is ₩170,000 (Xeomin) or ₩350,000 (Allergan). International patients pay the same price, and the final amount is confirmed at consultation.
Is there downtime after face slimming treatments?
Jawline Botox usually has fast recovery. Fat-dissolving injections may cause temporary swelling or tenderness, and thread lifts can cause swelling or bruising. Most people return to daily activities quickly; your doctor will confirm downtime for your plan.
Will jawline Botox affect chewing?
Some people notice slight chewing fatigue with tough foods for a short time after jawline Botox. Normal eating is not usually affected. Your doctor sets the dose to balance slimming with comfortable function.
Related pages
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About this information: Prepared from Yaan Clinic's published treatment information. Treatments at Yaan Clinic are performed by licensed physicians — meet our doctors. Last updated: October 2026. This page is general information, not a substitute for an in-person medical consultation; suitability, dosage and results are confirmed by your doctor.
