Slim your jaw and masseter muscles
10 min typical treatment time
Doctor-led clinical care
Non-surgical in-clinic treatment
All-inclusive pricing & ongoing support
Slim enlarged masseter muscles and reduce a square jaw with a non-surgical approach that balances your profile.
When structural imbalance or habitual clenching thicken the masseter muscles, the lower face becomes wide and bulky.
We use precise adjustments to reduce the masseters, for a slimmer jawline contour.
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As seen in
When natural methods aren't enough
Slim your jaw the medical way.
The burden of structural tension
A square jaw can create a constant impression of heaviness. Overactive masseter muscles add bulk and tension, creating a wide lower face.
Natural methods don't reduce bulk
Facial exercises and gua sha relax tension and reduce fluid, but they don't slim jaw muscles. True refinement targets the cause to slim the jaw.
This isn't just about your appearance
It’s about the relief of a balanced profile & from tension that let's you get about your day without managing how you look, or managing jaw and TMJ pain.
The Undetectable Standard™ at every step
Our clinicians personalise your treatment using our 3-Pillar Framework™ to achieve naturally seamless results.
Treatment info
Treatment objectives
Suitability
Preparation
Aftercare
Results
Why people trust Cosmetic Connection
We move beyond “beauty retail” to provide a doctor-led environment.
Our focus is on thoughtful, measured assessments, and calculated clinical plans, ensuring your treatment is guided by medical expertise.
Identify your suitability before you commit to a treatment.
Our process evaluates your anatomical baseline, providing clarity that replaces the risk of a vague “discovery session”.
We replace guesswork with calculation.
By applying our 3-Pillar Framework (Anatomy, Aetiology (cause), Goals), we ensure every treatment is clinically appropriate and structurally sound.
To maintain integrity, we removed the incentive for over-treatment.
Our transparent flat-fee pricing ensures your clinician is focussed purely on your result, not the amount of product.
By applying the 90/10 Rule of Restraint, we refine your appearance while protecting your natural character.
Your result looks like you, not like you had a treatment.
What causes a wide or square jawline?
The primary cause of a wide or square jawline is enlargement (hypertrophied) masseter muscles. The masseters are the paired muscles located at the back of the jawline, and are involved in chewing. Some people have naturally large masseter muscles, while others develop them due to dietary choices, or stress-related tension. Not only do large masseter muscles widen your jaw and lower face, they can also result in TMJ dysfunction, teeth grinding, jaw clenching, and pain.
Other structures closely related to the masseters can also contribute to a wide or square lower face. They include the underlying mandible (jaw) bone, facial fat, and the parotid salivary glands.
Facial proportions also play a role – a short chin and flat cheekbones can give the face a square or wide look.
How jaw slimming works
Jaw slimming combines several non-invasive techniques tailored to each individual. The approach is based on the understanding of facial anatomy, including muscles, fat pads, and bone structure. Key mechanisms include:
Masseter reduction treatment for lower-face slimming
The most common way to slim the jawline involves treatment to reduce the masseter muscles, the paired chewing muscles at the back of the jaw. As these muscles relax they reduce in size, leading to a slimmer jaw, and a softer, more tapered lower face. These methods are particularly useful for people with a square or heavy lower face due to strong, enlarged masseter muscles.
Assessment and examination
A personalised assessment is the cornerstone of jaw slimming treatment. During your consultation, clinicians evaluate several key aspects:
- Facial structure – examining bone structure, cheek projection, and jawline shape.
- Muscle activity – assessing masseter size and tone to determine the most effective treatment approach.
- Skin condition – evaluating elasticity, firmness, and overall skin quality.
- Proportions and symmetry – identifying areas that may benefit from subtle volume support.
- Patient goals – discussing aesthetic preferences, expectations, health, and desired outcomes.
This thorough assessment ensures a customised treatment plan that targets the areas most likely to provide noticeable, natural-looking changes aligned with your expectations.
Relieve TMJ, stop clenching & teeth grinding
Some people suffer from frequent headaches, jaw pain, or a perpetually tense jaw as a result of bruxism (teeth grinding/clenching) or temporomandibular joint (TMJ) disorder. Beyond the discomfort, chronic jaw clenching and grinding can also lead to an overly square or wide lower face due to the enlargement of the masseter muscles.
The problem: Overactive jaw muscles
The large, powerful masseter muscles, located at the angle of your jaw, are primarily responsible for chewing. However, habits like stress-induced clenching (Bruxism) or a TMJ-related disorder can cause these muscles to become chronically overworked, leading to:
- Pain and discomfort: Persistent jaw soreness, tension headaches, earaches, and discomfort when chewing.
- Dental issues: Potential wear, chipping, or damage to your teeth from grinding.
- Facial widening (Masseter hypertrophy): The constant use and bulking of the masseter muscles can create an undesired square or boxy appearance in the lower face.
The solution: Targeted masseter treatment
There are various methods to reduce the masseter muscles, all of which involve easing tension and relaxing them. By easing masseter muscle tension, non-surgical methods aim to:
- Alleviate jaw tension and pain
- Reduces the intensity of teeth grinding and clenching
- Eases TMJ-related headaches and discomfort
Because the masseter muscle contributes to the appearance of your lower face, treatments to alleviate tension an also create a slimming effect. As the masseter muscles relax, they reduce in size (atrophy) over several weeks. This reduction in muscle bulk results in a:
- Softer, more tapered jawline
- Contoured and slimmer lower face
- More balanced and V-shaped facial profile
Have questions?
Read the FAQ below for general information. For personalised advice, start here.
Jaw slimming refers to treatments designed to reduce the width of the lower face by addressing the masseter muscles (the chewing muscles at the sides of the jaw). This can create a softer, more tapered lower-face appearance.
A wider or more square jawline is often due to enlarged masseter muscles. This can be influenced by genetics, teeth grinding (bruxism), jaw clenching, or frequent chewing habits.
By reducing the activity and size of the masseter muscles over time, the lower face can appear less bulky. This creates a more contoured and balanced jawline shape.
You may be suitable if you notice a wide lower face, prominent jaw muscles, or symptoms such as jaw tension or clenching. A consultation is required to assess your anatomy and confirm suitability.
Jaw slimming treatments that target the masseter muscles may provide relief for symptoms associated with temporomandibular Joint (TMJ) disorders.
Jaw slimming methods may help individuals who experience teeth grinding (bruxism) and jaw clenching. These habits are frequently linked to overactivity or tension in the masseter muscles, which are the primary muscles involved in chewing and jaw clenching.
Discomfort is typically minimal. The procedure is quick, and most patients tolerate it well, describing only brief sensations during treatment.
When performed conservatively, the goal is gradual softening rather than dramatic change. Treatment is tailored to maintain facial balance and avoid an over-reduced or hollow appearance.
Changes are gradual. Most patients begin to notice slimming of the jawline over several weeks, with full results developing over time as the muscle reduces in size.
Results are temporary and vary between individuals. Maintenance treatments are usually required to sustain the effect over time.
There is usually little to no downtime. Most patients return to normal activities immediately after treatment.
When performed by a qualified and experienced practitioner, jaw slimming treatments are generally considered safe. A thorough assessment is important to ensure appropriate technique and suitability.
The masseter muscles are involved in chewing, but normal function is typically maintained. Some patients notice mild fatigue when chewing tougher foods initially, which usually settles as the muscles adapt.
Jaw slimming does not cause jowls, however reducing the masseter muscles can pre-existing jowls more noticeable temporarily.
This is why careful assessment is essential. Treatment should always consider your facial structure, skin quality, and overall lower-face balance to ensure an appropriate approach.
Jaw slimming is carefully tailored to your anatomy. For suitable candidates, treatment can refine lower-face width while maintaining balance. If there is existing skin laxity or reduced structural support, alternative jaw slimming approaches may be recommended.
Reducing masseter muscle bulk does not cause skin sagging, but it can reduce structural fullness in the lower face. In patients with pre-existing laxity, this may make softness or jowling more visible, which is why practitioner assessment is critical.
For those with pre-existing laxity, other jaw slimming methods may be recommended.
