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Jawline (masseter) Botox in Seoul

When a strong chewing muscle makes the lower face look wide or square, relaxing it with Botox can gradually soften the angle of the jaw. It is one of the most requested ways to support a slimmer, V-line shape without surgery.

What jawline Botox is and how it works

The masseter is the thick muscle at the back of the jaw that you use to chew and clench. In some people it is naturally large; in others it grows bulkier over time through habits such as regular clenching or chewing hard foods. A prominent masseter widens the lower face and gives the jaw a square outline.

Jawline Botox places small, measured doses of Botox into this muscle. As the muscle relaxes, it is used less forcefully, and over the following weeks it can gradually become slimmer. The result is a softer jaw angle and a more tapered lower face — a change that happens slowly and tends to look natural rather than sudden.

Which layer it targets and who it suits

In our 8-layer Skin Architecture model — epidermis, upper dermis, full-thickness dermis, lower dermis, subcutaneous fat, fascia, muscle and bone — masseter Botox works in the muscle layer. This is the key question at consultation: is the width of your lower face really coming from muscle?

Masseter Botox is often a good fit for:

  • A square or wide jaw where the muscle bulges when you clench
  • People hoping for a softer, more oval or V-line face shape
  • An asymmetric jaw where one side's muscle is more developed
  • Those who want gradual change with no surgical recovery

If the fullness is mainly fat under the jaw, Onda Face may help more. If the jawline is blurred because of sagging, lifting with HIFU or RF is usually the better starting point. If the bone structure itself is wide, Botox will have a limited effect, and the doctor will tell you honestly.

What happens on the day

A director sees you from the first consultation. The doctor feels the muscle while you clench and relax, checks both sides for differences, and looks at your face from the front and in profile. This helps decide how much product each side needs and exactly where to place it, so that the result is balanced and your smile is not affected. The plan is saved in your Skin Library for future adjustment.

The injections take only a few minutes. A fine needle is used at a few points on each side of the jaw, and most people feel brief pinches.

Downtime, results and how long they last

Visible downtime is usually minimal. Small bumps or minor bruising can occur and settle quickly. On the day, avoid touching or massaging the jaw for 4–6 hours, and skip saunas, alcohol and strenuous exercise.

  • Starts working: the muscle begins to relax in about 3–7 days
  • Peak relaxation: around 2 weeks
  • Visible slimming: develops gradually over the following weeks as the muscle becomes less bulky
  • Lasts: roughly 4–6 months

Chewing may feel slightly weaker on hard foods for a while, which most people find easy to adapt to. Results vary from person to person, and with repeated sessions some people find the muscle stays slimmer for longer.

Often combined with

A refined jawline usually involves more than one layer. Masseter Botox is often paired with chin filler to improve the profile, with Onda for fat under the jaw, or with HIFU such as CoolSoniq to tighten the support layer. The doctor will explain the order that suits your face.

Is it right for me?

Jawline Botox works best when muscle is the main cause of width. It is not recommended during pregnancy or breastfeeding, and some medical conditions and medications need to be reviewed first. We will suggest another approach if muscle is not the main factor.

For international visitors

Because the slimming effect develops over several weeks, many visitors have the treatment in Seoul and see the change at home. Ask us on WhatsApp for a personalised quote, and send a few front and side photos with your travel dates.

Preparing for your visit

  • Note whether you clench or grind your teeth, especially at night — this helps the doctor plan the dose.
  • Bring front and side photos if you would like to track the gradual change.
  • Tell the doctor about medications, medical conditions and previous Botox.
  • On the day, avoid sauna, alcohol and strenuous exercise after treatment.

At a glance

  • Layer: Muscle (masseter)
  • Best for: Square jaw, V-line contour
  • Downtime: Usually minimal
  • Starts working: 3–7 days, peak ~2 weeks
  • Slimming: Gradual, over several weeks
  • Lasts: Around 4–6 months

Questions about jawline Botox

  • When will my face look slimmer?

    The muscle starts to relax within about 3–7 days and reaches peak relaxation around 2 weeks. The visible slimming develops more gradually over the following weeks as the muscle becomes less bulky.

  • Will it affect my chewing or smile?

    Chewing very hard foods may feel slightly weaker for a while. Careful placement is designed to avoid affecting your smile, which is why the doctor examines the muscle closely before treatment.

  • How do I know if my jaw is muscle or fat?

    The doctor feels the muscle as you clench and checks the area from several angles. If fat or sagging is the main cause, a different treatment such as Onda or HIFU may be suggested.

  • How often should it be repeated?

    The effect usually lasts around 4–6 months. Many people repeat it at that interval, and the doctor may adjust the dose over time based on how your muscle responds.

Talk to us about jawline Botox

Message us on WhatsApp in English. Obliv Clinic Seoul Origin, Pagoda Tower, 93 Cheonggyecheon-ro, Jongno-gu — about 5 minutes on foot from Jonggak and Euljiro 1-ga stations, close to Myeongdong.

This page is general information, not medical advice. Suitability, number of sessions and results vary from person to person and are decided with a doctor at consultation.