What masseter Botox actually does
The masseter is the thick chewing muscle at the back of the jaw, just in front of the ear and above the angle of the jaw. In some people it is naturally large, and in others it grows bulkier from habits such as clenching, grinding at night or chewing gum often. When this muscle is prominent, the lower face can look square or wide, even if the person has little fat in that area.
Masseter Botox, often called jaw Botox, places small amounts of botulinum toxin into this muscle. The toxin temporarily reduces how strongly the muscle contracts. A muscle that works less over time tends to become less bulky, and that gradual change is what creates a softer, slimmer jawline. This mechanism explains why facial slimming is not instant.
Before booking, it also helps to know that a wide lower face can have several causes. Bone structure, fat, skin laxity and muscle size all play a part. Botox only changes the muscle component, which is why a doctor will usually ask you to clench your teeth during the consultation to feel how much of the width comes from the masseter.
A realistic timeline for facial slimming
Every person responds a little differently, so treat the following as a general guide rather than a promise. Your doctor can give you a clearer expectation after examining your jaw.
- The first few days.
You will not see slimming yet. Some people notice mild tenderness or a small bruise at the injection points, which usually settles on its own.
- Around one to two weeks.
The toxin takes effect on the muscle. Many people notice that chewing hard or chewy food feels a little more tiring, and that the bulge when clenching is less firm.
- Several weeks after treatment.
This is when visible change usually appears, as the less-active muscle slowly reduces in bulk.
- The following months.
The effect gradually wears off as muscle activity returns. How long it lasts depends on muscle size, metabolism, habits such as clenching and the dose used.
Because the result builds over weeks, taking front and angled photos on the day of treatment makes it easier to judge your progress later.
Why some people see change faster than others
A number of factors influence how quickly and how clearly the jawline changes:
- Starting muscle size.
A very prominent masseter often shows a more noticeable change, while a modest muscle may show only a subtle difference.
- Clenching and grinding.
People who clench strongly may keep stimulating the muscle, which can affect how the result develops and how long it lasts.
- Other causes of width.
If fat or bone contributes most to the width, Botox alone may not create the shape you imagine.
Planning jaw Botox around a trip to Busan
Many international visitors fit jaw Botox into a short stay because the appointment itself is quick and there is usually little visible downtime. Since the slimming appears after you return home, the main thing to plan for is time to consult a doctor before the injection, not recovery time afterwards.
- Book early in your trip.
This leaves a few days to check in with the clinic if you have any questions about tenderness or bruising.
- Avoid heavy pressure on the jaw that day.
Doctors commonly advise against massaging the area or applying strong pressure right after injections.
- Tell the doctor about your health.
Pregnancy, breastfeeding, neuromuscular conditions and certain medications are important to mention. If any apply, consult a doctor before deciding on treatment.
- Consider combinations carefully.
Some visitors ask about pairing jaw Botox with other contouring options. Read our overview of Korean V-line contouring
and discuss what suits your face at consultation.
Price of jaw Botox at Daybeau Clinic Seomyeon
At Daybeau Clinic Seomyeon, Jaw Botox 50 units is listed at 9,900 KRW. This is a first-visit price, VAT excluded (10% VAT is added at payment), checked October 2026. First-visit prices apply once per new patient per item. You can see the full range of options on our price list
and learn more on the jaw Botox page.
Payment is made at the clinic on the day of treatment, after the consultation confirms your plan.
Possible side effects to know about
Jaw Botox is a common procedure, but like any injection it carries some risks. Well-known effects include temporary tenderness, small bruises, mild swelling and a feeling of chewing fatigue. Less commonly, people notice a slight change in their smile or an uneven result, which a doctor can assess at follow-up. If you have unusual symptoms after any injection, contact the clinic or a doctor promptly. Suitability and results vary between individuals, and the doctor decides at consultation whether treatment is appropriate.
Frequently asked questions
When will I see my face look slimmer?
Muscle weakening usually begins within the first couple of weeks, but visible slimming tends to develop gradually over the following weeks as the muscle reduces in bulk. The exact timing differs from person to person.
Will jaw Botox affect my ability to eat?
You should still be able to eat normally. Some people find very chewy or tough foods more tiring for a while, which tends to ease as you adapt and as the effect wears off.
Can I have jaw Botox and fly home the next day?
Many visitors do, since there is usually little visible downtime. Mention your travel plans during the consultation so the doctor can give you aftercare advice suited to your schedule.
Does it help with teeth clenching?
Some people with clenching habits find their jaw feels more relaxed, but jaw Botox is not a substitute for a dental assessment. If you grind your teeth, it is worth speaking to a dentist as well.
Curious whether your jaw width comes from muscle? Book a consultation
or message us on WhatsApp with your travel dates and questions.
