Jaw Botox results timeline

The masseter is the strong chewing muscle at the angle of the jaw. When it is large, often from genetics, clenching or grinding, the lower face looks square. Botulinum toxin relaxes the muscle, and because a relaxed muscle is used less, it gradually becomes smaller. That is why the slimming effect is slow, unlike wrinkle Botox where results show within days.

When	What you may notice	What is happening
Day 0	No visible change; small injection marks fade quickly	Toxin is placed in the masseter
Weeks 1–2	Chewing tough food feels weaker; clenching eases	The muscle relaxes
Weeks 2–4	Very subtle softening at the jaw angle	The muscle begins to shrink from reduced use
Weeks 4–8	A visibly slimmer, softer lower face	Muscle volume continues to reduce
Months 2–3	Peak contour	Maximum muscle reduction
Months 4–6	Gradual return of muscle bulk	Nerve signals recover; plan the next session

Read more about the procedure on our jaw Botox treatment page.

What improves and what doesn't

Usually improves

A square jaw caused by a bulky masseter
The look of a wide lower face in photos
Jaw tension from clenching
The balance between the upper and lower face

Usually does not change

A wide jaw caused mainly by bone structure
Fat under the chin or along the jaw
Sagging jowls, which can sometimes look more noticeable once muscle bulk reduces
Teeth damage from grinding, which needs a dentist's assessment

Factors that influence your results

Muscle size: a larger masseter usually shows a bigger change.
Dose: jaw treatment needs more units than wrinkle Botox, and the right amount depends on your muscle; read how many units of jaw Botox you need.
What causes the width: muscle responds; bone and fat do not.
Chewing habits: frequent gum chewing and very chewy foods keep the muscle working.
Repeat treatments: regular sessions can help the muscle stay smaller, which may lengthen the time between them.

How to maximize and maintain your results

Many lower faces look wide for more than one reason. If fat also plays a role, compare jaw Botox vs fat-dissolving injection. For a sharper contour, Shurink Universe HIFU can be added to tighten the jawline. The V-Line Contour Package combines all three.

Avoid massaging or pressing on the jaw for the rest of the day.
Skip saunas and intense exercise on the day of treatment.
Limit gum chewing and very hard or chewy foods for the first few weeks.
If you grind at night, ask your dentist about a night guard.

Realistic expectations and when to repeat

Jaw Botox gives a softer, more oval lower face, not a different bone structure. The change is gradual enough that most people notice it in photos before others comment. If you are visiting Seoul, you will likely see the result after you return home. Most people repeat it every four to six months, and some can stretch the interval after a few sessions. Our medical team's jaw Botox review covers value, and current options are on the jaw Botox price page. Prices are in Korean won (KRW), exclude 10% VAT, and are confirmed at your consultation.

Tracking your progress

Slimming happens slowly, so the mirror is unreliable. Take photos before treatment and at four, eight and twelve weeks.

Use the same window light and time of day.
Take a straight-on photo with your teeth lightly apart and face relaxed.
Take a second photo while clenching, which shows the muscle clearly.
Tie hair back and keep the camera at eye level.

If your results aren't what you expected

Wait at least eight weeks before judging the contour. If you see little change, or one side looks different from the other, contact Dernia with your photos so your doctor can review them. The cause may be dose, an uneven muscle, or bone or fat contributing more than expected. If your smile feels different or chewing stays unusually weak, let us know. Explore other options in our results guides.

How long does jaw Botox take to work?

Clenching usually eases within one to two weeks. Visible slimming takes longer, typically four to eight weeks, because the muscle shrinks gradually.

How long does jaw Botox last?

The effect typically lasts about four to six months. With regular sessions, some people find the muscle stays smaller for longer.

Why can't I see a difference after two weeks?

At two weeks the muscle has relaxed but not yet shrunk. Most of the visible slimming appears between four and eight weeks.

Will jaw Botox make my face sag?

It does not cause sagging, but in people who already have loose skin, reducing muscle bulk can make jowls look more noticeable. Your doctor will assess this before treatment.

Does jaw Botox help with teeth grinding?

It can ease clenching and jaw tension. Grinding can damage teeth, so you should also see a dentist for assessment.

About the treatment

Jaw Botox in Seoul — masseter slimming
Jaw Botox price — from ₩59,000 both sides
Jaw Botox review — our medical team's verdict

Related treatments

Fat-dissolving injection — for small fat pockets
Trapezius Botox — for shoulder contour
Wrinkle Botox — for expression lines

Areas and guides

Jawline and V-line treatments — all options
Double chin — under-chin options
Korean Botox brands explained — choosing a toxin
Skin treatments for men — popular choices

Dernia Clinic Myeongdong

Jaw Botox Results: Timeline and What to Expect