Jawline Botox in Seoul

See jawline Botox prices at Yaan Clinic →

Home › Cosmetic Dermatology › Jawline Botox

Jawline botox, also called masseter botox or square-jaw botox, is an injection of botulinum toxin into the masseter (chewing) muscle to slim a wide lower face. At Yaan Clinic in Gangnam, Seoul, jawline botox uses genuine XEOMIN by MERZ, Germany, with injection points and dose set after an individual analysis of your muscle by doctors who are Official Key Doctors of MERZ.

Jawline botox is one of the most requested non-surgical treatments in Korea for people who want a softer, more oval or "V-line" face shape without jaw surgery.

What is jawline botox?

Jawline botox is a treatment that relaxes the masseter muscle at the angle of the jaw. When this muscle is overdeveloped, the lower face looks square or wide. Relaxing it lets the muscle gradually become less bulky, so the jawline looks slimmer over several weeks.

The masseter is the muscle you feel bulge at the corner of your jaw when you clench your teeth. It can become large from genetics, frequent chewing or clenching and grinding. Because the masseter is a muscle and not bone, it responds to botulinum toxin in a way the jawbone itself cannot. Yaan Clinic describes this as using botox to slim overdeveloped muscles.

Who is a good candidate for jawline botox?

The best candidates have a wide or square lower face caused mainly by a large masseter muscle. A doctor can check this by feeling the muscle while you clench. If width comes from bone or fat, other treatments are more suitable.

Cause of a wide lower face	How to tell	Suitable approach
Large masseter muscle	Bulge at the jaw corner when clenching	Jawline botox
Fat along the jaw or under the chin	Soft tissue, no change with clenching	Double chin treatment
Sagging jowls	Tissue drops below the jawline	Thread lifting or skin tightening
Wide jawbone	Width remains with relaxed muscle	Bone surgery (not offered as part of this treatment)

Many faces have more than one cause, which is why Yaan Clinic often plans jawline botox as part of a wider non-surgical facial contouring plan. For a full overview, read our guide to square jaw and face slimming.

How is jawline botox done at Yaan Clinic?

The doctor first analyzes your masseter muscle while you clench and relax, then sets the injection points and dose for each side. The injections take only a few minutes, and most people return to normal activities straight away.

1. Consultation – you share your goals and any history of clenching or grinding.
2. Muscle analysis – the doctor feels and observes the masseter on both sides, since the two sides are often different sizes.
3. Dose design – injection points and units are set for your muscle, not a standard template; men and women often need different planning.
4. Injection – a few fine-needle injections are placed into each masseter.
5. Aftercare – you receive post-treatment instructions, which matter most in the early period.

When will I see results from jawline botox?

Jawline slimming is gradual. The muscle typically starts to relax within days, and the visible slimming usually develops over several weeks as the muscle becomes less bulky. Your doctor will explain the expected timeline.

This differs from wrinkle botox, where the effect is seen sooner. Because slimming happens as the muscle shrinks with reduced use, international patients usually see the full result after returning home. Effects typically last several months, and repeated treatments may help maintain a slimmer muscle, though Yaan does not publish a fixed duration.

Are there side effects of jawline botox?

Side effects are usually mild and temporary. Some people notice slight tiredness when chewing hard foods for a short time, or small injection marks and occasional bruising. Your doctor will explain risks at consultation.

Dosing matters. Too high a dose or poorly placed injections can affect the smile or cause a hollow below the cheekbone. This is why Yaan sets the dose individually and uses genuine product in the correct dosage. Learn more on the genuine products and safety page.

Can jawline botox help with teeth clenching?

Many people with a large masseter also clench or grind their teeth. Relaxing the masseter is commonly used for this, and some patients notice less jaw tension. However, clenching and grinding (bruxism) have several causes, so discuss them with your doctor and dentist.

At Yaan Clinic, jawline botox is offered as an aesthetic treatment. If jaw pain, joint clicking or tooth wear is your main concern, a dental assessment is also recommended.

How much does jawline Botox cost at Yaan Clinic in Seoul?

At Yaan Clinic, jaw (masseter) Botox costs ₩170,000 with Xeomin or ₩350,000 with Allergan. The same price applies to salivary gland and temporalis Botox.

Botox at Yaan Clinic	Xeomin (KRW)	Allergan (KRW)
Wrinkle Botox	₩100,000	₩160,000
Jaw (masseter) / salivary gland / temporalis Botox	₩170,000	₩350,000
Trapezius or calf Botox, 100 units	₩290,000	₩700,000
Skin Botox / pore Botox, full face	₩490,000	₩690,000

Yaan states that it uses genuine product in the correct dosage, so the price reflects the full dose your plan requires. 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 our jawline Botox price guide, the Botox price guide and all treatment prices.

Jawline botox vs other V-line treatments

Jawline botox slims muscle, while filler adds projection, threads lift sagging and fat-dissolving injections reduce fat. Combining jawline botox with chin filler is a common way to make the lower face look narrower and longer.

Treatment	What it changes	Speed of result
Jawline botox	Masseter muscle bulk	Gradual, over weeks
Chin filler	Chin projection and length	Immediate
Thread lift	Sagging along the jaw	Immediate, with collagen effect over time
Fat-dissolving injection	Localized fat	Gradual, over weeks

Yaan's FAQ confirms botox and filler can be combined in the same visit. For other areas treated with botox, see the botox in Seoul hub, including calf reduction.

Frequently asked questions

Related pages

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.