Facial Slimming — Masseter Botox and Buccal Fat Considerations

Last updated: 5 March 2026

Facial slimming has become one of the most requested aesthetic procedures in recent years, driven by a cultural shift towards more angular, contoured facial aesthetics. At Axiom Aesthetics, we offer masseter Botox as an effective, non-surgical facial slimming treatment while providing honest guidance about buccal fat removal — a surgical procedure that requires careful consideration.

Understanding Facial Width

Facial width in the lower face is determined by several anatomical structures:

• Masseter muscles: The primary chewing muscles that sit at the angle of the jaw. Enlarged (hypertrophic) masseters create a square, wide lower face
• Buccal fat pads: Deep fat compartments in the cheeks that contribute to facial fullness
• Bone structure: The mandible (jawbone) width is genetically determined and cannot be changed non-surgically
• Subcutaneous fat: General facial fat that varies with body weight
• Parotid glands: The salivary glands located just in front of the ears can contribute to lower face width

Accurate assessment of which structures are contributing to facial width is essential for selecting the right treatment approach. Treating masseter hypertrophy with Botox will not help if the width is primarily due to buccal fat, and vice versa.

Masseter Botox: The Non-Surgical Solution

What Is Masseter Botox?

Masseter Botox involves injecting botulinum toxin directly into the masseter muscles to reduce their size and activity. This is based on the principle that any muscle that is prevented from contracting will gradually atrophy (shrink). By relaxing the masseters with botulinum toxin, the muscles reduce in bulk over several weeks, creating a slimmer, more tapered lower face.

Who Benefits Most from Masseter Botox?

The best candidates have:

• Masseter hypertrophy: Enlarged masseter muscles from habitual clenching, teeth grinding (bruxism), or genetics
• Square jaw appearance: A broad, angular lower face that the patient wishes to soften
• Bruxism symptoms: Teeth grinding, jaw pain, tension headaches — masseter Botox treats these medical symptoms while providing the aesthetic benefit
• Defined jawline beneath the muscle: The slimming effect works best when good bone structure is revealed as muscle bulk reduces

How to Identify Masseter Hypertrophy

You can assess your own masseters by placing your fingertips on your jaw angle and clenching your teeth. If you feel a significant muscle bulge that creates visible width, you likely have some degree of masseter hypertrophy. In clinic, we assess this clinically and can use ultrasound to measure muscle thickness if precise documentation is needed.

The Treatment Process

• Assessment: Clinical examination to confirm masseter hypertrophy as the primary cause of facial width
• Injection: Typically 25-50 units per side (total 50-100 units), injected at multiple points within the masseter muscle
• Duration: The injection process takes approximately 10-15 minutes
• Discomfort: Minimal — the needle penetrates muscle, which has fewer pain receptors than skin
• Results onset: Functional effects (reduced clenching force) within 1-2 weeks; visible slimming effects develop over 4-8 weeks as the muscle atrophies

Results and Maintenance

The slimming effect from masseter Botox is progressive:

• 2-4 weeks: Reduced jaw clenching and grinding; subtle early slimming
• 6-8 weeks: Noticeable reduction in lower face width; softer jaw angle
• 3-4 months: Maximum slimming effect achieved
• Duration: Effects last 4-6 months initially, but with regular treatments (every 4-6 months), intervals between treatments can lengthen as the muscle becomes consistently smaller

Research published in Dermatologic Surgery found that after 3-4 treatment cycles, masseter volume was reduced by an average of 30%, with some patients maintaining results for up to 12 months between treatments.

Additional Benefits of Masseter Botox

Beyond facial slimming, masseter Botox provides several therapeutic benefits:

• Relief from bruxism (teeth grinding)
• Reduced jaw pain and TMJ dysfunction symptoms
• Fewer tension headaches
• Reduced tooth wear from grinding
• Better sleep quality (night-time grinding disrupts sleep)

Buccal Fat Removal: Important Considerations

What Is Buccal Fat Removal?

Buccal fat removal (buccal lipectomy) is a surgical procedure that removes the buccal fat pads — encapsulated fat deposits in the cheeks. The procedure is performed through small incisions inside the mouth and permanently removes a portion of the fat pad to create a more sculpted, hollowed cheek appearance.

Why We Urge Caution

While buccal fat removal has gained significant social media popularity, we believe patients should approach this procedure with careful consideration for several important reasons:

Irreversibility

Unlike Botox, which wears off, buccal fat removal is permanent. Once the fat is removed, it cannot be replaced (except with filler, which is a temporary solution to a permanent problem). This means that if your preferences change, or if the results do not meet expectations, reversal is extremely difficult.

Ageing Considerations

The face naturally loses volume with age. Buccal fat pads provide important structural support that becomes increasingly valuable as we grow older. Removing them in your twenties or thirties can lead to a gaunt, prematurely aged appearance in your forties and fifties. Several prominent plastic surgeons have publicly expressed concern about the long-term consequences of this procedure in younger patients.

Dr Bryan Mendelson, a leading facial anatomy researcher, has described buccal fat as “the last fat pad to atrophy with age,” meaning that removing it eliminates a natural cushion against age-related volume loss.

Facial Harmony

A modest buccal fat pad contributes to facial balance and softness. Excessive removal can create an overly angular, harsh appearance that does not harmonise with the rest of the facial structure. The “ideal” level of facial fullness varies enormously between individuals and is influenced by overall facial structure, body habitus, and ethnic background.

When Buccal Fat Removal May Be Appropriate

Despite our caution, buccal fat removal can be appropriate in select cases:

• Patients over 35-40 with genuinely excessive buccal fat that creates a disproportionate “chipmunk cheek” appearance
• Those who have maintained a stable weight and still have prominent buccal fullness
• Patients who understand and accept the long-term implications, including the potential for premature facial ageing
• Those who have been counselled about alternatives and still wish to proceed

Alternative Approaches to Facial Slimming

Before considering buccal fat removal, several non-surgical alternatives are worth exploring:

Fat Dissolving Injections

Injectable deoxycholic acid (Aqualyx, Kybella) can reduce subcutaneous fat in the lower face. Unlike buccal fat removal, the reduction is more gradual and affects superficial fat rather than deep fat pads. This approach allows for more controlled, incremental change.

Contouring with Filler

Strategic placement of dermal filler along the cheekbones, jawline, and chin can create the appearance of a slimmer face by enhancing surrounding structures. Adding definition to the cheekbones and jawline creates contrast that makes the mid-face appear slimmer without removing any tissue.

Radiofrequency Skin Tightening

RF treatments can improve skin laxity in the lower face, reducing the appearance of jowling and creating a more defined jawline. This can contribute to an overall slimmer facial appearance.

Creating Your Facial Slimming Plan

At Axiom Aesthetics, we recommend a comprehensive assessment before any facial slimming treatment. This includes evaluating the specific structures contributing to facial width, discussing your goals and the aesthetic you wish to achieve, considering your age and how the treatment will age with you, reviewing non-surgical options before considering surgical intervention, and creating a treatment plan that can be adjusted based on results.

Frequently Asked Questions

Does masseter Botox change the shape of my face permanently?

No. Masseter Botox effects are temporary, lasting 4-6 months per treatment. If you stop treatment, the muscles will gradually return to their original size over several months. However, patients who maintain regular treatments over several years may experience more lasting muscle atrophy, as the muscle fibres gradually reduce with sustained disuse. Even in these cases, stopping treatment will eventually allow some muscle regrowth.

Will masseter Botox affect my ability to chew?

When performed correctly with appropriate dosing, masseter Botox should not significantly affect chewing function. The masseters are just one of four pairs of muscles involved in chewing, and the dose used for slimming only partially weakens them rather than fully paralysing them. Some patients notice slightly reduced chewing power with very tough foods (such as steak or toffee) for the first few weeks, but this does not affect normal eating. If chewing is significantly impaired, the dose was likely too high — an experienced practitioner will find the right balance.

How much does masseter Botox cost?

Masseter Botox typically costs between £300 and £500 per treatment, depending on the amount of toxin required. Patients with significant hypertrophy may need more units than those with mild enlargement. The investment should be viewed in the context of 4-6 months of results, plus the therapeutic benefits for bruxism and jaw tension. During your consultation, we will provide an accurate quote based on your specific needs.

I am in my 20s — is buccal fat removal a good idea?

We strongly encourage caution about buccal fat removal in your twenties. Facial fullness in your twenties is not only normal — it is a sign of youth. Many patients who find their face “too full” at 25 will appreciate that same fullness at 40 and 50 when facial volume loss becomes a concern. We recommend exploring non-surgical options first (masseter Botox, contouring with fillers) and, if you are still considering buccal fat removal, consulting with a surgeon who specialises in facial aesthetics and can provide honest long-term counselling.

Can masseter Botox and buccal fat removal be combined?

While technically possible, we recommend a sequential approach: try masseter Botox first, assess the results over 2-3 treatment cycles, and only then consider whether additional intervention is needed. In many cases, masseter Botox alone provides sufficient slimming, eliminating the need for a surgical procedure. If both are ultimately pursued, the combination can produce a significant transformation, but it is important to proceed gradually to avoid an overly hollowed appearance.