Look for a clinic in Seoul that checks whether your jaw width comes from muscle, fat or bone before injecting, and that explains the product, units, price and repeat timing up front. At COCO Clinic in Seoul, masseter Botox takes under five minutes, the slimming shows from 2–4 weeks, the muscle volume returns in about 6 months, and repeat sessions are planned 6–12 months apart.
Short Answer: What a Good Masseter Botox Clinic in Seoul Looks Like
No single clinic is the right choice for everyone. A good clinic first checks whether your jaw width comes from muscle, because Botox only reduces muscle. It then explains the limits, side effects and repeat timing before it injects anything. COCO Clinic in Seoul offers masseter Botox as part of its muscle Botox menu, alongside the trapezius and calves. The rest of this article covers where your width comes from, who may be a poor fit, and what to compare between clinics.
How Does Masseter Botox Slim the Jaw?
The masseter is the chewing muscle at the angle of the jaw. It thickens with use, much like any trained muscle, so grinding at night, clenching during the day and chewy foods all add to its bulk. Botox blocks the signal that tells this muscle to contract. A muscle that is used less gradually becomes smaller, and a squared lower face settles into a gentler curve. The muscle cells do not disappear; they shrink, which is why the change is reversible.
This is also why the result is not instant. The signal is blocked right after the injection, but the muscle needs time to shrink. The change shows from 2–4 weeks and is clearest around 6–8 weeks. "Jaw Botox" and "square-jaw Botox" usually mean this same treatment. How Botox relaxes a muscle without cutting the nerve is explained in How to Tell a Muscle to Rest — Botox: Myths and Truth.
Is Your Jaw Width From Muscle, Fat or Bone?
A wide lower face generally comes from bone, fat or muscle, and often from more than one. Botox can only reduce the muscle part. It cannot narrow the jawbone or remove facial fat, so the muscle may account for only part of what you see.
| Likely source of width | What masseter Botox can do | What to ask a clinic |
|---|---|---|
| Muscle (a firm bulge at the jaw angle when you clench) | Gradually reduces the bulk of the chewing muscle | How is muscle thickness judged, and what product and units are planned? |
| Fat (a softer, fuller lower face) | Cannot remove facial fat | What suits fat-related width, and is it offered there? |
| Bone (a wide frame that looks the same when relaxed) | Cannot change the jawbone | What can realistically change, and what cannot? |
At COCO Clinic, the muscle is checked by touch with your teeth clenched, and bone and fat factors are checked at the same time. If the area below the jawline stays full even after jaw Botox, the salivary gland may be the cause. That case is covered in Masseter Botox but No Change? It May Be Your Salivary Glands.
Who May Not Be a Good Fit
Masseter Botox is not given during pregnancy or breastfeeding, or to people with neuromuscular disorders. It is also a poor fit when:
- the width comes mainly from bone or fat
- the face is already thin, with little cheek fat
- the skin has lost a lot of elasticity
The last two matter because the masseter also supports the skin and fat above it. As the muscle shrinks, that support decreases, so in a thin face an excessive dose can make the cheeks look hollow. This is why the dose is set from skin elasticity and fat volume as well as the muscle, and why combining it with a lifting treatment is sometimes discussed.
People who usually suit it have a square lower face from a developed chewing muscle, or a jaw that often feels stiff from grinding or clenching. Morning jaw stiffness often eases alongside the slimming.
How Long Does It Last, and Why Are Repeat Sessions 6–12 Months Apart?
Botox itself works for about 2–3 months, so the effect starts to wear off after about 3 months. The muscle then recovers slowly, and its volume takes about 6 months to return. That 6 months is the duration COCO Clinic gives for masseter Botox.
Repeat sessions are planned 6–12 months apart, for two reasons. Retreating before the muscle has fully recovered lets the reduction build up, so the effect tends to last longer with each session. Topping up too often, on the other hand, raises the chance that the body forms antibodies to the toxin, which can make later sessions work less well. That is why COCO Clinic keeps retreatment at least 6 months apart and does not top up while the previous effect is still there.
For visitors from abroad, the injection is a single visit, but the slimming builds over the following weeks. Plan around the 6–12 month interval rather than expecting a finished result before you leave Seoul.
Side Effects and Aftercare
Common reactions are bruising, swelling or tenderness at the injection points, which settle within days. For the first 2–4 weeks the jaw can feel stiff, or chewing hard food can feel weaker; this usually settles on its own. Less often, a slight asymmetry appears, which can be adjusted with dose and placement and fades with time. Because the nerve endings regrow, these effects are not permanent either.
After the injection:
- do not touch or press the area for 4 hours, and avoid sleeping face-down or massaging it
- avoid alcohol that day and vigorous exercise for 24 hours
- makeup is fine the same day
How to Compare Masseter Botox Clinics in Seoul
A checklist works for any clinic, including ones you find yourself. Look for a clinic that:
- checks muscle, fat and bone before injecting
- names the product it uses and how many units are planned
- explains the repeat interval and why it does not top up early
- is open about side effects and limits instead of promising a result
- states the price clearly, including VAT
Prices that look similar can cover different products and different numbers of units. Compare the product, the units, whether VAT is included, and whether the price is per session or per area.
Price and Planning a Visit
At COCO Clinic, muscle Botox starts from ₩90,000 for 50 units, VAT included, and the price varies by product. COCO Clinic has been open since February 2017. Its current prices, location and opening hours are on the COCO Clinic website.
A professional consultant at COCO Clinic provides a detailed one-on-one consultation, and the doctor may also conduct a brief assessment before the procedure.
Results vary between individuals.
Frequently Asked Questions
Can masseter Botox slim a jaw that is wide because of bone?
No. It relaxes the chewing muscle, so it cannot change the jawbone or remove fat.
How long does masseter Botox last at COCO Clinic?
The slimming shows from 2–4 weeks and is clearest at 6–8 weeks. The muscle volume returns in about 6 months, and repeat sessions are planned 6–12 months apart.
Will masseter Botox affect how I chew?
For the first 2–4 weeks chewing can feel stiff or weaker, especially with hard food. This usually settles on its own.
Can my cheeks look hollow afterwards?
With an appropriate dose placed accurately, this is uncommon. It is more likely when there is already little cheek fat or reduced skin elasticity, which is why both are checked before the dose is set.
Is one trip to Seoul enough?
The injection is done in one visit and takes under five minutes, but the slimming builds over the following 2–4 weeks. Plan the next session 6–12 months later.
References
- [1] Botox Muscle Reduction — cococlinic.kr
- [2] How to Tell a Muscle to Rest — Botox: Myths and Truth — cococlinic.kr