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Two matte clay forms side by side on cream linen, one broad and squared and one narrower and tapered — editorial illustration for masseter reduction surgery at Troell Cosmetic Surgery, Las Vegas
Facial Procedure

Masseter Reduction Surgery in Las Vegas

Permanent narrowing of a wide lower face when the width is muscle — partial resection of the masseter through an incision inside the mouth, explained with what the published record shows and where it is thin

30+ Years Experience
58+ Peer-Reviewed Publications

What Is Masseter Reduction Surgery?

Masseter reduction surgery removes part of the masseter — the thick chewing muscle that sits over the back corner of the jaw — to narrow a lower face that is wide because the muscle is large. Also called masseter muscle reduction surgery, partial masseter resection, masseter debulking or jaw slimming surgery, it is done through an incision inside the mouth, so nothing is cut on the skin, and the change is permanent because the removed muscle does not grow back.

It is the structural answer to a complaint that has a repeatable answer too. Botulinum toxin thins the same muscle by blocking its nerve signal, and the muscle rebuilds when the effect wears off; our guide to masseter Botox versus surgery sets the two side by side over twelve months, and the Botox page covers the injectable route on its own. This page is about the operation.

The decision this page exists to explain comes before any of that: whether the width is muscle at all — and, if it is, whether the muscle needs to be operated on. Both questions have honest answers in the published record, and one of them is not the answer a surgical page is expected to give.

Muscle, Bone or Fat — and Whether the Muscle Needs Surgery at All

A wide lower face has three possible causes, and only one of them is treated by this operation. The examination sorts them before anything is proposed.

The Clench Test

Bite down and press the back corner of the jaw. What firms up and bulges under your fingers is masseter. Width that is exactly the same at rest and on clenching is bone. Soft fullness lower and further forward in the cheek is the buccal fat pad. Three different tissues, three different operations.

When It Is Bone

A flared mandibular angle is a skeletal shape, and no amount of muscle removed will narrow it. Most of the surgical literature on this subject is bone surgery from East Asia with the muscle reduced alongside it,[1][2] and one 56-patient series found that reducing the bone alone shrank the masseter by about a fifth over four years without the muscle being touched.[3] If your width is bone, the honest consultation says so instead of proposing muscle surgery for a bone problem.

When It Is Fat

Fullness in the lower cheek that does not change on clenching is the buccal fat pad, which sits in front of the jaw angle rather than over it. That is buccal fat removal, a different operation on a different tissue — and removing it does nothing for the back corners of the jaw.

Is There a Driver?

A masseter that is large because it is worked hard — clenching, grinding, a habit you do in your sleep — is a muscle with a reason. The operation reduces bulk regardless of the reason, but jaw pain, headache and tooth wear from clenching are separate problems that removing muscle does not solve, and the examination asks about them by name.

Reversible or Permanent

An injection thins the muscle for a season and the muscle returns. Resection is permanent in both directions: the narrowing does not fade, and it cannot be undone if you decide you preferred the fuller line. Patients who have already lived with the injected result for a year know something about their own face that first-timers do not.

One Side or Two

Masseters are often uneven, and a patient who chews on one side can have a visibly larger muscle there. The amount removed is planned side by side rather than as one number for both, and correcting an asymmetry is as legitimate a reason for the operation as narrowing a symmetrical face.

When the Answer Is an Injection and When It Is Surgery

Dr. Troell treats masseter hypertrophy by both routes, so the consultation is not constrained to whichever one a practice happens to offer. They are not a weaker and a stronger version of the same treatment; they work by different mechanisms and suit different people.

Injection fits first-timers and anyone who wants to see the narrower line before committing to it. The evidence for botulinum toxin here is real but short: a 2026 meta-analysis of five randomised placebo-controlled trials with 536 participants found a pooled relative risk of 5.25 for reaching a low masseter-prominence score at four weeks with 48 units, with a wide confidence interval of 1.88 to 14.66, substantial heterogeneity, and a stated inability to define an optimal dose or protocol.[6] The 2013 Cochrane review that preceded it screened 683 references and found no trial it could include at all.[7] Side effects of the injection, when they occur, mostly appear within two to four weeks and are gone within twelve.[8]

Resection fits the patient who has had the injected result, wants it to stop being a repeating appointment, and accepts that a permanent change carries a permanent set of risks. The muscle comes out in part, through the mouth, and stays out. What the published series say about how much narrowing that buys, and what it can cost, is set out below rather than summarised into an adjective.

The long version of that comparison — what a neuromodulator measurably does to the muscle, what happens at twelve months, and what a decision-grade evaluation includes — is our guide to masseter Botox versus surgery. How the two approaches differ in mechanism, in a shorter form, is on Dr. Troell’s masseter reduction page.

The Complications to Ask About by Name

The masseter is a chewing muscle, and the honest version of this page spends more words on that fact than on the narrower jawline. Four things are documented, and you should be able to ask about each of them and get a straight answer.

Restricted mouth opening. Trismus is the complication specific to operating on a muscle whose job is to close the jaw. A published case report describes a patient who developed trismus, altered sensation and a secondary angle deformity after partial masseter resection combined with angle reduction performed elsewhere; its authors conclude that the need for masseter resection in square-jaw patients must be approached with caution.[4] That is one case rather than a rate, which is exactly why it is worth naming: the large series report satisfaction, and the case report reports what a bad outcome looks like.

Altered sensation. The 151-patient series that followed partial masseter resection with angle reduction for three years on CT reported swelling and lower-lip numbness as its complications, and no infection and no facial nerve injury.[1] Numbness of the lower lip after jaw-angle surgery is a nerve the operation works near, not a nerve it cuts, and most sensory change settles — but “most” is a word to hear in the consultation, not read afterwards.

Asymmetry. Two muscles reduced by hand will not be reduced identically, and a face that was uneven before surgery can be uneven differently after it. Planning the resection side by side is how that is limited; it is not how it is eliminated.

Hollowing over the angle. Where the muscle is lifted off the lower border of the jaw during bone surgery, its attachment can fail to re-adhere; the muscle then rides up, leaving a skeletonised angle with a soft bulge above it. A Massachusetts General Hospital series describing that deformity found signs of it in 9 of 60 patients presenting after mandibular angle surgery done elsewhere, and describes the reattachment used to repair it.[5] It is a complication of the bone operation more than of muscle resection alone, and it is on this page because “jaw slimming” is sold as one thing when it is several.

What the Published Record Reports

151 Patients followed for three years on CT after partial masseter resection with angle reduction (Yuan, 2013)
21% Reduction in masseter volume on each side in that series — 21.31% left, 20.77% right
47 Patients in the 2022 comparison of muscle resection plus bone reduction against bone reduction alone (Du, 2022)

Three things about those numbers deserve saying plainly. First, nearly all of the surgical evidence is East Asian jaw-contouring surgery in which the muscle was reduced together with the bone, not muscle resection on its own. The 151-patient series measured muscle volume down by about a fifth on each side at three years, with all patients reporting satisfaction and no infection or facial nerve injury.[1] The 2022 study of 47 patients found that adding partial masseter resection to bone reduction produced a greater decrease in masseter volume and in lower-face width than bone reduction alone, both at p < 0.001, with higher satisfaction in the combined group — but it is Level of Evidence IV, not randomised, and it studied the combined operation.[2]

Second, the muscle shrinks on its own when the bone beneath it is reduced. A 56-patient series with three-dimensional CT four years after bone reduction alone found the masseter had atrophied by 20.98 percent, especially its lower part, with no complications, and its authors concluded that most patients with a prominent angle should be treated without approaching the muscle at all.[3] That is a finding a surgical page should carry rather than bury: where the width is bone, the muscle may not need an operation.

Third, evidence for muscle resection by itself is thin. It exists as case reports and as an option within jaw-contouring reviews — a 2026 narrative review lists partial masseter muscle resection among the procedures selected according to specific skeletal and soft-tissue features, and names neurosensory safety, soft-tissue support and long-term remodelling as endpoints the field has not yet standardised.[9] No practice can quote you a complication rate for isolated masseter resection from a large series, because none has been published. What it can tell you is which of these operations it is proposing, and why.

Why Choose Dr. Troell for Masseter Reduction

Dr. Troell treats masseter hypertrophy by both routes — botulinum toxin and surgical partial resection — and trained in otolaryngology — head and neck surgery before facial plastic surgery, which is the route through the anatomy of the jaw, its chewing muscles and the nerves that run beside them. He has not published on masseter reduction specifically. Where his own peer-reviewed research bears on a procedure on this site it is cited by DOI; on this one, every clinical figure comes from the primary literature and is cited in full below, and nothing on this page claims his approach differs from or improves on anyone else’s, because that is not a claim the record supports.

Dr. Robert J. Troell, MD, FACS is a Diplomate of the American Board of Facial Plastic and Reconstructive Surgery (ABFPRS), a Diplomate of the American Board of Cosmetic Surgery (ABCS), and a Diplomate of the American Board of Otolaryngology – Head and Neck Surgery, with over 30 years in practice and training at the University of South Florida and Stanford University, where he later served as a Clinical Professor. He has held an active Nevada medical license since 2001 and has practiced in Las Vegas for more than 20 years. You can review his published work and credentials and decide for yourself.

Consultations are with Dr. Troell himself — he is the only surgeon at the practice, and the person who examines you is the person who operates. Consultation, surgery, and every follow-up visit happen at the same office, 5375 S Fort Apache Rd in Las Vegas, which serves patients from Spring Valley and Summerlin South, Enterprise, and across the valley to Henderson and North Las Vegas.

Dr. Robert J. Troell, MD, FACS, facial plastic surgeon in Las Vegas who performs masseter reduction surgery at Troell Cosmetic Surgery

How Much Does Masseter Reduction Surgery Cost in Las Vegas?

Masseter reduction is quoted at consultation for the operation your examination calls for. There is no single number, because “jaw slimming” is not a single operation.

What moves the figure:

  • One side or two, and how much muscle each side needs removed.
  • Whether the width is muscle alone. A jaw that is wide because of bone is a different conversation, and a plan that quotes muscle surgery for it has not examined the difference.
  • Whether anything is combined with it — jowl or neck liposuction, a chin implant to balance a narrowed lower face — which changes theatre time rather than adding separate prices.
  • Which anesthesia pathway the procedure uses, and the facility time that goes with it.

Troell Cosmetic Surgery is a cash-pay practice: you are quoted for the operation, and the quote is what it costs. Financing options are available. If you are weighing a one-time operation against years of repeated injections, the arithmetic and the twelve-month evidence are set out in our guide to masseter Botox versus surgery.

Masseter Reduction Recovery Timeline

An incision inside the mouth and a smaller chewing muscle mean eating differently for a while and working the jaw back to full opening. Timelines below are typical; individual recovery varies, and your own instructions are written for your own operation.

Days 1–7

Swelling and Soft Food

Swelling over the jaw angle peaks in the first days and makes the face look wider, not narrower. A soft or liquid diet and mouth rinses protect the intraoral incision; sleeping with the head elevated helps.

Weeks 1–2

Opening the Jaw

Gentle mouth-opening exercises on instruction, because a muscle that has been operated on tightens. Most patients return to sedentary work within one to two weeks, still visibly swollen along the jawline.

Weeks 2–6

Chewing Again

Firmer food returns gradually; strenuous exercise and contact activity wait on instruction. Altered sensation along the lower lip or jaw is common early and usually settles.

Months 3–6+

The Line You Judge

The last swelling over a chewing muscle is slow to leave. The contour worth judging is the one at three to six months; the published series measured their results at three and four years.[1][3]

Healing a face in Las Vegas also means healing in a great deal of sun: the city gets 85 percent of its possible sunshine, about 3,782 hours a year, by long-term NOAA climate normals.[10] Because the incision is inside the mouth there is no external scar to protect — but where liposuction of the jowl or neck is combined and a small skin port is used, the American Academy of Dermatology advises a broad-spectrum sunscreen of SPF 30 or higher whenever clothing won’t cover a scar,[11] and under the jaw nothing does.

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Masseter Reduction Surgery FAQs

How do I know whether my wide jaw is muscle, bone or fat?

Clench and press the back corner of your jaw. What firms up and bulges under your fingers is the masseter, and that is what this operation reduces. Width that is identical at rest and on clenching is the mandibular angle — bone — and no muscle surgery narrows it. Soft fullness lower and further forward in the cheek is the buccal fat pad, which is buccal fat removal, a separate operation. The examination confirms which one you are before anything is proposed.

Is masseter reduction surgery permanent?

Yes, in both directions. The portion of muscle removed does not grow back, so the narrowing does not fade the way an injected result does — and it cannot be undone if you decide you preferred the fuller jawline. The 151-patient series that measured the result on CT three years later found masseter volume down by about 21 percent on each side.[1] That permanence is the reason many patients try the injectable route first and come to surgery already knowing how a narrower lower face looks on them.

Will there be a visible scar?

No. The operation is performed through an incision inside the mouth, so there is nothing on the skin of the face or jaw. If liposuction of the jowl or neck is combined with it, a small skin port under the jaw is used for that part and is protected from the sun while it fades.

Will I be able to open my mouth and chew normally afterwards?

The masseter is a chewing muscle, so this is the right question. Restricted mouth opening, called trismus, is the complication specific to operating on it: a published case report documents trismus, altered sensation and a secondary angle deformity after partial masseter resection combined with angle reduction performed elsewhere, and its authors urge caution in deciding who needs the muscle resected at all.[4] Early tightness is expected and is worked through with mouth-opening exercises on instruction; the large series report swelling and lower-lip numbness rather than lasting loss of function.[1] Ask about it by name, and expect a straight answer.

Masseter Botox or masseter reduction surgery — which should I have?

An injection thins the muscle for a season and the muscle rebuilds when the effect wears off; surgery removes part of it permanently. The trial evidence for the injection is real but short-term — five randomised trials, 536 participants, a pooled relative risk of 5.25 for a lower masseter-prominence score at four weeks, with a wide confidence interval and no settled dose[6] — and the surgical evidence is mostly combined muscle-and-bone series from East Asia.[1][2] First-timers usually start with the injection; the patient who has lived with that result and wants it to stop being a repeating appointment is the one for whom surgery is a serious conversation. Dr. Troell performs both, and the long comparison is in our guide to masseter Botox versus surgery.

Does the bone need to be reduced as well as the muscle?

Only if the width is bone, and then the question runs the other way — whether the muscle needs reducing at all. A 56-patient series with three-dimensional CT four years after bone reduction alone found the masseter had shrunk by about 21 percent without being touched, and its authors concluded that most patients with a prominent angle should be treated without approaching the muscle.[3] A jaw that is wide because of bone is a different operation on the jaw itself, and the consultation says so plainly rather than proposing muscle surgery for a skeletal shape.

If my mouth opening stays restricted or one side ends up narrower than the other, what actually happens — and what would a revision cost me?

The honest structure to demand from any practice is who evaluates a concern, where, and what the escalation path is. At Troell Cosmetic Surgery, concerns after masseter reduction are evaluated by the operating surgeon himself — Dr. Robert J. Troell is the practice’s only surgeon and sees his own follow-up visits in the same Las Vegas office — and he holds hospital privileges at Summerlin Hospital Medical Center should a complication ever need hospital-level care. For this operation the follow-ups measure the things that matter: how wide the mouth opens, whether the two sides match, and how sensation along the lower lip is recovering, over the months it takes swelling over a chewing muscle to leave. Whether a revision is appropriate, and on what terms, is a case-by-case decision made at those follow-ups once healing has declared itself; the revision fee basis is discussed with you then, and no surgeon can honestly tell you in advance what a revision would cost you, or promise that one will not be needed. What you should leave a consultation knowing is who you will see if something is not right, and where.

How long is recovery from masseter reduction surgery?

Typically, a soft diet and mouth rinses in the first week while the intraoral incision heals, a return to sedentary work within one to two weeks, firmer food and normal exercise over the following month on instruction, and mouth-opening exercises throughout. Swelling over the jaw angle makes the face look wider before it looks narrower, and the contour worth judging is the one at three to six months. Individual recovery varies.

Can masseter reduction be combined with a chin implant or neck liposuction?

Frequently the request is for a narrower lower face rather than for one muscle, and narrowing the jaw angles can make a recessed chin read weaker. Whether a chin implant or liposuction of the jowl and neck belongs in the same plan is decided at the examination, from the profile view as much as the front one. Combining changes theatre time rather than adding separate operations on separate days.

How much does masseter reduction surgery cost in Las Vegas?

It is quoted at consultation for the operation your examination calls for. One side or two, how much muscle each side needs removed, whether anything is combined with it, and the anesthesia and facility time that follow all move the figure. This is a cash-pay practice and financing options are available.

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Research Cited on This Page

  1. Yuan J, Zhu QQ, Zhang Y, Qi ZL, Wei M. Influence of partial masseter muscle resection along with reduction of mandibular angle. Journal of Craniofacial Surgery 2013;24(4):1111–1113. doi:10.1097/SCS.0b013e31828f2449. PMID 23851750 (151 patients, CT before and 3 years after partial masseter resection with mandibular angle reduction; masseter volume reduced 21.31 ± 7.64% left and 20.77 ± 7.45% right; complications swelling and lower-lip numbness; no infection or facial nerve injury; all patients satisfied)
  2. Du H, Zhang D, Jin X. Reduction Mandibuloplasty Along with Partial Masseter Muscle Resection: Masseter Muscle Response and Bone Regeneration. Aesthetic Plastic Surgery 2022;46(1):310–318. doi:10.1007/s00266-021-02356-7. PMID 34031737 (47 patients; reduction mandibuloplasty with partial masseter resection versus mandibuloplasty alone, CT-measured; greater decrease in masseter volume and lower-face width, both p < 0.001, and higher satisfaction in the combined group; Level of Evidence IV, not randomised)
  3. Fu X, Rui L, Liu J, et al. Long-term changes in the masseter muscle following reduction gonioplasty. Journal of Craniofacial Surgery 2014;25(4):1309–1312. doi:10.1097/SCS.0000000000000776. PMID 24902113 (56 patients with 3D CT before and 4 years after reduction gonioplasty without masseter resection; masseter atrophied 20.98 ± 8.75%, especially its lower part; no complications; authors conclude most patients with prominent mandibular angles should be treated without approaching the muscle)
  4. Kim JH, Lim SU, Jin KS, Lee H, Han YS. The postoperative trismus, nerve injury and secondary angle formation after partial masseter muscle resection combined with mandibular angle reduction: a case report. Journal of the Korean Association of Oral and Maxillofacial Surgeons 2017;43(1):46–48. doi:10.5125/jkaoms.2017.43.1.46. PMID 28280710 (single case report of trismus, dysesthesia and secondary angle formation after surgery performed elsewhere; authors conclude the need for masseter resection in square-jaw patients must be approached with caution)
  5. Thomas MA, Yaremchuk MJ. Masseter muscle reattachment after mandibular angle surgery. Aesthetic Surgery Journal 2009;29(6):473–476. doi:10.1016/j.asj.2009.09.006. PMID 19944991 (60 patients presenting for mandible augmentation 2003–2008; 9 showed signs of pterygomasseteric sling disruption after prior mandibular angle surgery, 5 complete and 4 partial; reattachment through a Risdon approach with drill holes at the inferior border)
  6. Machado GF, De Freitas LR, Ribeiro LFS, et al. Efficacy of botulinum toxin for masseter muscle hypertrophy: A systematic review and meta-analysis. Journal of Plastic, Reconstructive & Aesthetic Surgery 2026;119:212–225. doi:10.1016/j.bjps.2026.06.012. PMID 42379083 (five randomised placebo-controlled trials, 536 participants; pooled relative risk of a low masseter-prominence score at week 4 of 5.25, 95% CI 1.88–14.66 at 48 U; substantial heterogeneity; authors describe short-term benefit and evidence insufficient to define an optimal dose or protocol)
  7. Fedorowicz Z, van Zuuren EJ, Schoones J. Botulinum toxin for masseter hypertrophy. Cochrane Database of Systematic Reviews 2013;(9):CD007510. doi:10.1002/14651858.CD007510.pub3. PMID 24018587 (683 references screened, 23 full texts assessed, none eligible; no randomised or controlled trial of botulinum toxin for benign bilateral masseter hypertrophy identified as of April 2013)
  8. Yeh YT, Peng JH, Peng HP. Literature review of the adverse events associated with botulinum toxin injection for the masseter muscle hypertrophy. Journal of Cosmetic Dermatology 2018;17(5):675–687. doi:10.1111/jocd.12721. PMID 30091170 (36 articles, 1994–2018; most complications appeared within 2–4 weeks of injection and resolved within 12 weeks)
  9. Xie Z, Bai X, Guo Z, Yang L, Teng L. Mandibular angle osteotomy in Asian patients: A narrative review on techniques, emerging technologies, and personalized surgical strategies. JPRAS Open 2026;51:230–247. doi:10.1016/j.jpra.2026.06.008. PMID 42519404 (narrative review, Level of Evidence V; partial masseter muscle resection listed among procedures selected by skeletal and soft-tissue features; endpoints named include neurosensory safety, soft-tissue support and long-term remodelling; authors call for standardised outcome measures)
  10. Current Results — Las Vegas weather averages, from NOAA NCEI long-term climate normals (85% of possible sunshine; about 3,782 hours of sunshine a year; 210 mainly clear days)
  11. American Academy of Dermatology — Scars: Diagnosis and Treatment (“always wearing sunscreen when clothing won’t cover your scar”; a broad-spectrum sunscreen with SPF 30 or higher)

Sources checked September 29, 2026. The published literature describes how the field reduces the masseter and what it reports going wrong; the technique in each series is its authors’, and your own plan is set at an examination of your own jaw. Individual results vary.

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Find Out Whether Your Jaw Width Is Muscle at All

Muscle, bone or fat — an examination that names which, and a plan that says whether the muscle needs an operation, an injection, or neither.

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