Masseter botox has no fixed number of units: the dose is matched to the thickness and clenching strength of the chewing muscle at your jaw angle, and each toxin product counts its units on its own scale. ENTER Plastic Surgery charges the masseter as one area, ₩150,000 + VAT with Korean toxin, so the bill does not move unit by unit.
What sets the number of masseter Botox units
The masseter is the thick muscle you feel hardening at the back of the cheek when you bite down. Its size varies widely between people, and between your own left and right side, so the amount of toxin is worked out for your jaw at the appointment. These points shape it:
| Factor | What is checked | Effect on the dose |
|---|---|---|
| Muscle bulk | How far the muscle bulges when you clench | A larger muscle generally takes more product |
| Clenching or grinding | Jaw ache, worn teeth, a hard bite | A muscle in heavy use may need a fuller dose |
| Left and right | One side standing out more | The two sides can receive different amounts |
| Toxin tier | Korean toxin, Xeomin or Allergan Botox | Units are counted per product |
| Earlier sessions | Last date and how your jaw responded | Guides whether the plan changes |
When the width sits in the jawbone itself or in lower-cheek fat, there is little muscle for the toxin to work on, and adding units will not narrow the face. A firm press on the jaw corner while you clench and relax gives a rough idea: a muscle that swells under your fingers is the part the injection can change.
Why masseter Botox units differ between toxin brands
A unit of botulinum toxin is a measure of biological activity, and each manufacturer defines it with its own laboratory test. The prescribing information for Botox (Allergan) and for Xeomin both state that their units cannot be converted into those of another product, and Korean-made toxins are measured on their own scales as well. A unit count quoted online for one brand is therefore a weak guide to the amount drawn up from a different vial.
At ENTER Plastic Surgery the masseter comes in three tiers, Korean botulinum toxin, Xeomin and Botox by Allergan, each priced as one area. Choosing a tier changes the product and the line on the price list, and the amount is then planned for that product. The Korean tier appears on the list by category, without a product name.
Total exposure over time also deserves attention. A meta-analysis of 43 studies covering 8,833 patients found neutralizing antibodies in 1.8% of people treated with botulinum toxin type A, with the rate climbing as treatment continued over longer periods, and it suggested antibody testing when the effect fades for no clear reason (Rahman, 2021). Those figures include medical uses as well as cosmetic ones.
A first masseter Botox appointment, in order
The clinic has not published a lighter or heavier first dose, so a first visit runs through the same sequence as a repeat one:
Assessing the jaw
You clench and relax while both sides of the muscle are felt, and you choose the toxin tier.
Placing the points
Injection points are placed over the bulkiest part of the muscle on each side.
Injecting
The injections take 10–15 minutes, and no anesthesia is used.
The next few hours
You stay upright for 3–4 hours; a flight is fine once four hours have passed.
The change
The muscle thins over 2–4 weeks, and the effect holds for about 4–6 months.
Because the jaw changes slowly, the response to a given dose shows weeks later, which on a short trip falls after you are back home. Take a front-facing photo before the injections and another one month on in the same light; side by side, they show what the units achieved and help plan the next session.
At a glance
Masseter Botox pricing and timing facts
| Charged per | One masseter area |
|---|---|
| Same price line | Temple or salivary gland |
| Priced per 100 units | Trapezius and calves |
| Injection time | 10–15 minutes |
| Anesthesia | None |
| Visible slimming | 2–4 weeks |
| Effect holds (clinic guidance) | About 4–6 months |
| Repeat interval | 3–6 months |
Evidence
Research behind this page
- Immunogenicity to Botulinum Toxin Type A: A Systematic Review With Meta-Analysis Across Therapeutic IndicationsAesthetic Surgery Journal · 2021 · Rahman E et al. · doi:10.1093/asj/sjab058
A 2021 meta-analysis of 43 studies and 8,833 patients found neutralizing antibodies to botulinum toxin type A in 1.8% of patients, rising with longer treatment; it covered medical as well as cosmetic uses.
- Adverse Events of Botulinum Toxin Type A in Facial Rejuvenation: A Systematic Review and Meta-AnalysisAesthetic Plastic Surgery · 2016 · Jia Z et al. · doi:10.1007/s00266-016-0682-1
A 2016 meta-analysis of 16 studies and 42,405 patients treated for facial rejuvenation found adverse events more frequent than with placebo, mostly mild to moderate, including headache and eyelid symptoms.
FAQ
Masseter Botox units: common questions
Is there a standard number of units for jaw Botox?
No. The amount depends on how bulky and strong each masseter is, whether one side is larger, and which toxin product is used, since units differ between products. The plan for your jaw is set after the muscle has been examined while you clench and relax.
Will I pay more if my masseter needs extra units?
No. ENTER Plastic Surgery prices the masseter as one area for each toxin tier, so the price line stays the same whether your muscle is thick or slim. The trapezius and calves are the lines charged in blocks of 100 units, and every line is listed before VAT.
Does a first-time masseter treatment use a lower dose?
The clinic has not published a separate first-time dose. A first session is planned the same way as any other, from the size of the muscle and the tier you choose. Its result is easiest to judge two to four weeks later, once the muscle has had time to thin.
Are both sides of the jaw always given the same amount?
Not necessarily. When one masseter is larger than the other, the two sides can receive different amounts so the lower face looks more even. Mention the side you chew on more, or any side that aches, because that detail helps decide how the dose is split.
If I switch from Korean toxin to Xeomin, do the units stay the same?
No. Each product measures its units with its own test, so a dose of one cannot simply be copied to another. Changing tier means the amount is planned again for the new product, and the masseter line on the price list changes to that tier as well.
Will I need more units each time I come back?
There is no clinic rule that the dose rises with each visit, and sessions are spaced three to six months apart. A small share of people form neutralizing antibodies over years of treatment, so tell the clinic if a previous session wore off unusually fast or had little effect.
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Great experience! Dr. is very sweet and kind. He listened to what I wanted to fix and correct. He explained everything very well. Wasn’t pushy and didn’t try to sell anything extra. This isn’t a clinic that comes out on instagram, which I…
Jennifer LyuA month agoI came to Enter Plastic Surgery on a friend’s recommendation for under-eye fat repositioning. I was pretty nervous going in, but the doctor took the time to explain what would work for my under-eyes, what the procedure involved, and what…
Michael2 months agoThe staff are incredibly friendly, and the consultation was very thorough. I was very worried since it was my first procedure, but the director explained the aftercare in detail, so I felt completely confident trusting them!!
ROOHEUI SHIN (RHS)2 months ago · Translated by Google