A Slimmer Jawline.An End to Grinding.
A precise muscle-relaxing injection into the masseter muscle that can reduce its bulk, soften the lower-face contour and help relieve the tension and discomfort of teeth grinding and jaw clenching. This treatment uses a prescription-only medicine; suitability is confirmed at a face-to-face consultation with a qualified prescriber.
Book Your Jawline Slimming Treatment01
Panel
What's Covered
The masseter is one of the most powerful muscles in the body — the primary muscle of mastication. Its size directly determines the width and squareness of the lower face. The treatment temporarily reduces masseter contractile activity; over weeks, the muscle reduces in bulk.
01Jawline slimming
As the masseter reduces, the lower face narrows and softens — producing a slimmer, more oval facial contour. The change is gradual and natural-looking, developing over 4–8 weeks. A refinement rather than a dramatic structural change.
02Bruxism and jaw tension relief
Bruxism generates forces of several hundred kilograms per cm², causing tooth wear, jaw pain, headaches, and TMJ dysfunction. Reducing masseter force directly reduces these symptoms — often more significant than improvement from a night guard alone.
03Standard dose — £•••
Appropriate for many patients presenting for jawline slimming or moderate bruxism. Produces meaningful masseter reduction and significant symptom relief in the majority of cases.
04Double dose — £•••
Recommended for patients with significantly hypertrophied masseter muscles — through genetics or long-standing heavy bruxism — where a higher dose is required. Also for patients with severe bruxism where maximum symptomatic relief is the priority.
05The treatment
A small number of precise injections into the masseter on each side, taking approximately 15–20 minutes. Topical anaesthetic or ice can be applied beforehand. The injections are brief and well-tolerated.
06TMJ benefit
By relaxing the masseter, the treatment can reduce the forces acting on the temporomandibular joint and may help relieve TMJ-related pain and tension alongside standard management.
Many patients present for one indication and find the other an equally valued benefit. Patients booking for jawline slimming frequently report near-elimination of morning jaw pain; patients booking for bruxism relief frequently notice the aesthetic change with equal satisfaction.
02
Audience
Who It's For
Masseter treatment serves both aesthetic and functional clinical purposes.
- Wide or square lower face caused by masseter hypertrophy — wanting a slimmer, more oval contour
- Bruxism — teeth grinding or jaw clenching causing jaw pain, morning headaches, tooth sensitivity, or TMJ dysfunction
- Wear a night guard for bruxism but want additional symptomatic relief
- Jaw tension and clenching contributing to chronic headaches or neck tension
- Combining masseter treatment with other facial aesthetic treatments as part of broader facial balancing
- TMJ disorder diagnosis — wanting an evidence-based intervention alongside standard management
03
Deliverable
Results and What to Expect
Both aesthetic and functional results develop progressively:
- Weeks 1–2: Onset of reduced masseter contractile activity; some patients notice early reduction in jaw tension
- Weeks 4–8: Visible reduction in masseter bulk and jawline slimming
- Months 3–4: Full result — masseter at its smallest and jawline at its more refined definition
- Duration: results typically last 3–6 months
- Regular maintenance sustains both aesthetic and symptomatic benefits
04
Difference
Why This Treatment
Masseter treatment sits at the intersection of aesthetic refinement and functional medicine — addressing the chronic forces that drive bruxism while simultaneously refining facial contour.
Two clinical goals, one treatment
A patient who books for jawline slimming frequently reports near-elimination of morning jaw pain as an unexpected improvement. A patient who books for bruxism relief frequently notices the aesthetic change with equal satisfaction.
Often more effective than a night guard alone
Night guards protect the teeth but do not reduce the forces driving bruxism. Reducing masseter contractile force directly reduces these symptoms at source.
TMJ benefit
Reduces the chronic load acting on the temporomandibular joint — often providing meaningful relief from TMJ pain, clicking, and dysfunction.
Standard or double dose
Dose tailored to your masseter size and clinical goals — standard for many clients, double for significant hypertrophy or severe bruxism.
Doctor-administered
Every injection at EGA is administered by a doctor with detailed knowledge of facial anatomy.
05
Questions
Common Questions
Will my chewing be affected?
Mildly and temporarily — some patients notice slightly reduced chewing efficiency in the first 2–4 weeks as the masseter weakens. This resolves as the body adapts. Normal diet is not affected; very hard foods may feel slightly more effortful during this period.
How long before I notice results for bruxism?
Many patients notice reduced jaw tension and fewer symptoms within 1–2 weeks. The full effect on bruxism symptoms develops after 2 weeks.
How long do results last?
Typically 3–6 months. Regular treatment sustains both the jawline slimming and the bruxism relief. With repeated treatments, some patients find that the interval between sessions lengthens.
Does the jawline return to its original shape after the treatment wears off?
Yes — the masseter gradually returns to its original size unless treatment is maintained. With regular long-term treatment, some degree of lasting reduction may occur as the muscle adapts.
Can this treatment help with TMJ disorder?
It may help. Relaxing the masseter can reduce the forces acting on the temporomandibular joint and may relieve symptoms alongside standard management. If you have a formal TMJ diagnosis, please mention this at your consultation.
Is this what people search for as jaw or masseter injections?
Yes. The medicine used is prescription-only; your prescriber will discuss the product and dose with you at your consultation.
Is there any downtime?
No. Mild tenderness at injection sites for 24 hours. Normal activities can be resumed immediately. Avoiding vigorous jaw exercise and extreme heat for 24 hours post-treatment is advised.
06 · Next Step
Ready to book?
A Slimmer Jawline.
- 01Book onlineReserve your treatment online or by phone.
- 02Masseter assessmentYour clinician assesses masseter size and recommends standard or double dose.
- 03TreatmentApproximately 20 minutes — precise injections under topical anaesthetic if preferred.
- 04Follow-upReturn at 2 weeks if needed; plan maintenance at 4–6 months.