Quick answer: Jaw Botox vs masseter reduction surgery: jaw Botox relaxes and shrinks a large masseter muscle with injections, slimming a square jaw gradually with no downtime. Surgery, such as mandibular angle reduction, removes bone and sometimes muscle for a permanent change, but needs general anaesthesia and weeks of recovery. Botox suits muscle-related width; surgery suits wide bone structure.
Key takeaways
- A square jaw can come from a large muscle, wide bone or both.
- Jaw Botox treats muscle; surgery mainly treats bone.
- Botox results appear over four to eight weeks and last about four to six months.
- Surgery is permanent but has real surgical risks and recovery time.
- Many people try Botox first to see how much of the width is muscle.
Why does the jaw look square?
The width of the lower face depends on the masseter muscle, the shape of the jaw bone and the fat and skin over them. Clenching, grinding and chewing hard food can make the masseter larger. Some people have a naturally wide jaw angle from their bone structure. A doctor can feel the muscle while you bite and look at your face shape to see which factor is the main cause.
What is jaw Botox?
Jaw Botox, also called masseter Botox, uses botulinum toxin injected into the masseter at the angle of the jaw. The muscle relaxes and gradually becomes smaller, so the lower face looks slimmer from the front. It can also reduce clenching and teeth grinding. Results appear over about four to eight weeks and usually last about four to six months, often longer after repeated treatments.
What is masseter reduction surgery?
Masseter reduction surgery usually refers to mandibular angle reduction, also called jaw reduction or V-line surgery, performed by a plastic or maxillofacial surgeon. Through cuts inside the mouth, the surgeon removes part of the jaw bone at the angle, and sometimes part of the muscle. It is done under general anaesthesia and gives a permanent change in shape.
How do jaw Botox and surgery compare?
- Target: Botox muscle; surgery mainly bone.
- Anaesthesia: Botox none; surgery general anaesthesia.
- Recovery: Botox none; surgery several weeks of swelling and a soft diet.
- Results: Botox gradual and temporary; surgery visible after swelling settles and permanent.
- Risks: Botox mild and temporary; surgery includes bleeding, infection, nerve injury and asymmetry.
When is jaw Botox the better choice?
Jaw Botox is usually the better first choice if you can feel a firm, bulky muscle when you clench, if you grind your teeth, or if you want a slimmer face without surgery. It is also a good test: if Botox slims your face a lot, your width is mainly muscle.
When might surgery be considered?
Surgery may be considered if your jaw is wide mainly because of bone, if Botox gives little change, or if you want a permanent result and accept the recovery and risks. It needs careful planning with a qualified surgeon and imaging such as CT scans.
Can other treatments help the jawline?
Yes. If sagging or fat also affects your lower face, lifting treatments such as Ultherapy or threads, and fat reduction treatments, can improve the jawline. Chin filler can also balance a wide jaw by adding length to the chin. A combined plan often gives the most natural V-line.
What is the recovery like?
After jaw Botox, you can return to normal activities right away, though chewing may feel weaker for a few weeks. After surgery, expect significant swelling for several weeks, a liquid or soft diet at first, and follow-up visits. Visitors usually need to stay in Korea for at least one to two weeks after surgery.
Is it safe?
Jaw Botox is safe in trained hands; side effects are usually mild, such as bruising or temporary chewing weakness. Surgery is a major operation with risks including bleeding, infection, nerve damage and uneven results. Choose a qualified surgeon and a hospital with proper facilities.
How to choose
Korea treated about 2.01 million foreign patients in 2025, and around 63% came for dermatology, according to the Ministry of Health and Welfare. Jaw slimming is one of the most popular requests. Most people start with non-surgical options and consider surgery only if bone is the main cause.
Frequently asked questions
Can Botox give a permanent result?
Not permanent, but repeated treatments can keep the muscle smaller for longer.
How many units are needed?
It depends on muscle size and the brand used. Your doctor will decide after examining you.
Does jaw Botox affect smiling?
When placed correctly, it should not change your smile.
Do you offer jaw surgery?
We focus on non-surgical treatments and can explain when a surgical opinion may help.
Sources
- Ministry of Health and Welfare, Republic of Korea – 2025 foreign patient statistics (press release, 2026).
- Ministry of Food and Drug Safety, Republic of Korea – botulinum toxin product approval information.
- American Society of Plastic Surgeons – facial contouring procedure information.
This article is for general information only and is not medical advice. Results vary between individuals. Please consult a qualified physician before any treatment.
