Target enlarged jaw muscles (masseter hypertrophy) with a safe, effective, and long-lasting non-surgical solution.
This clinically proven treatment offers precision facial contouring, ideal for those seeking a slimmer lower face, relief from jaw tension, or a softer, more balanced appearance.
✔️ Professional | Experienced | Trusted
✔️ Effective for facial slimming, contouring, and bruxism relief
✔️ Over 10,000 aesthetic procedures performed
✔️ Led by Dr Ng with 15+ years of clinical expertise
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Jaw reduction injections, often performed using Botulinum Toxin, are a non-surgical treatment used to slim the lower face by targeting the masseter muscles [1]. These muscles, located at the angle of the jaw, can become enlarged due to repeated overuse, a condition known as masseter hypertrophy [2]. This enlargement may result in a square or bulky jawline, facial tension, headaches, and in some cases, discomfort or difficulty with jaw movement.
Masseter hypertrophy is more common in certain ethnic groups and can also be caused by bruxism, a condition where individuals unconsciously clench or grind their teeth, either during the day or while asleep [3]. Over time, this repeated strain on the jaw muscles can lead not only to an enlarged jawline but also to facial pain, worn teeth, jaw dislocation, and other dental issues.
Jaw reduction injections work by relaxing the overactive masseter muscles, gradually reducing their size and softening the jawline for a more contoured appearance. The treatment is safe, quick, and requires minimal downtime, which makes it a popular option for those seeking a more refined facial profile without surgery.
Masseter hypertrophy refers to the enlargement of the jaw muscles, and its causes can vary widely between individuals. Contributing factors may include lifestyle habits, such as frequent chewing of hard foods or gum, and genetic predisposition. Some individuals naturally have stronger or more active jaw muscles, which may become more prominent over time.
Bruxism (involuntary teeth grinding or clenching), especially when chronic or stress-related, is another common cause [4]. While the exact cause of bruxism is often unclear, it is believed that stress, abnormal muscle function, or an imbalance in the chewing muscles may contribute. In some cases, muscle enlargement may be linked to a compensatory mechanism, where certain fibres work harder due to underactivity in others.
Understanding the underlying cause of masseter hypertrophy is essential for determining the most effective treatment approach, whether for cosmetic reasons or relief from functional discomfort.
In most cases, masseter hypertrophy can be diagnosed based on a physical examination and clinical history [5]. An aesthetic medical doctor will assess the shape and size of the jawline, palpate the masseter muscles, and enquire about symptoms such as jaw tension, clenching, or grinding.
However, in certain cases where the diagnosis is unclear or symptoms are complex, further investigations may be necessary. Imaging techniques such as MRI or CT scans can help rule out other structural causes. Electromyography (EMG) or ultrasonography may also be used to evaluate muscle activity and thickness with greater precision. Muscle biopsy is rarely required and is generally reserved for highly specific medical indications.
A thorough assessment ensures that treatment is appropriately tailored and that any underlying issues contributing to muscle enlargement are properly addressed.
At the core of our approach to jaw reduction is a focus on precision, safety, and individualised care. Botulinum Toxin masseter reduction is a non-surgical technique that not only enhances facial contours but also relieves discomfort caused by overactive jaw muscles.
Dr Ng has over 15 years of experience in administering Botulinum Toxin injections with a deep understanding of facial anatomy. His method involves careful assessment of each patient’s jaw structure, bite function, and aesthetic goals before proceeding with treatment. By injecting Botulinum Toxin Type A into specific points of the masseter muscles, the treatment helps relax muscle activity, soften the jawline, and reduce symptoms such as clenching or tension.
Every treatment plan is tailored to the patient’s unique needs, whether they are seeking cosmetic refinement, relief from jaw-related discomfort, or both. Dr Ng believes that successful results come from combining clinical expertise with a thoughtful, customised approach that puts patient safety and satisfaction first.
Botulinum Toxin works by temporarily reducing the activity of the masseter muscles, key muscles involved in chewing and jaw clenching [6]. When these muscles are overactive, they can enlarge over time, leading to a widened jawline. By injecting small, precise doses of Botulinum Toxin into the masseters, the nerve signals that trigger muscle contraction are blocked.
As the muscles become less active, they gradually shrink in size, a process known as muscle atrophy. This results in a slimmer, softer, and more contoured lower face over a period of weeks to months. In addition to reducing muscle bulk, some studies suggest that prolonged muscle relaxation may influence the underlying bone structure, particularly the mandibular angle, further enhancing facial shape [7].
This dual effect, on both muscle mass and potentially bone contour, explains why Botulinum Toxin jaw reduction is not only effective in refining the facial profile but also long-lasting when maintained with periodic treatments.
Before the procedure, a detailed consultation will be conducted to assess your facial anatomy, muscle activity, and overall suitability for treatment. You will be asked to clench your teeth, allowing the practitioner to palpate and identify the precise location of the masseter muscles on both sides of the jaw.
After cleansing the skin and applying a topical numbing cream, a series of small injections, typically 3 to 5 on each side, are administered into the most prominent areas of the masseter. The entire process usually takes less than 15 minutes.
Post-treatment care is simple but important. Patients are advised not to lie down for at least 4 hours, avoid alcohol for 72 hours, and refrain from massaging or applying pressure to the treated area. Regularly clenching your jaw or chewing gum for short periods in the days following treatment may help activate the muscles and enhance the effect of the toxin.
The number of Botulinum Toxin units required for jaw reduction depends primarily on the size and strength of your masseter muscles. Individuals with more prominent muscle bulk, often due to habitual clenching or genetic factors, will typically require a higher dosage to achieve effective relaxation and visible contouring.
For first-time patients, a moderate starting dose is generally recommended to assess responsiveness and achieve noticeable results safely. On average, most individuals require 24 to 30 units per side, though this may vary. Men or those with moderate to severe masseter hypertrophy often need a higher dose for optimal results.
We use a range of clinically approved Botulinum Toxin brands, all of which are effective in reducing muscle activity and reshaping the jawline. There is minimal difference in treatment outcome or longevity between the major brands.
A personalised consultation is necessary to determine the ideal dosage for your unique facial structure and treatment goals. Please contact us directly for a detailed assessment and pricing information.
Most individuals begin to notice visible slimming of the jawline within 4 to 6 weeks after the injection, with peak results appearing around the 6-week mark. Results typically last between 4 to 6 months, though this varies depending on individual muscle strength, metabolism, and lifestyle factors.
For longer-lasting outcomes, consistent follow-up treatments are recommended. With repeated sessions, the masseter muscles tend to weaken further, allowing results to last longer and requiring fewer treatments over time.
While jaw reduction injections are safe and suitable for most individuals, certain people may not be ideal candidates for this procedure. You should avoid treatment if you have:
A full medical history and consultation will always be conducted before treatment to ensure your safety and eligibility.
Botulinum Toxin jaw reduction provides both aesthetic and functional benefits, making it a popular choice for patients seeking facial slimming and relief from jaw-related tension.
Overactivity of the masseter muscles can lead to a widened, square-shaped lower face, especially in individuals who frequently clench or grind their teeth. By precisely injecting Botulinum Toxin into these muscles, their activity is reduced, which promotes gradual muscle relaxation and softening of the jawline. This results in a slimmer, more contoured lower face, creating a balanced, V-shaped or oval facial appearance that is particularly appealing to those with naturally square or wide jawlines.
Beyond cosmetic enhancement, Botulinum Toxin treatment can offer significant relief for individuals suffering from bruxism (teeth grinding) or temporomandibular joint disorders (TMD) [8]. Many patients report a noticeable reduction in jaw pain, headaches, and muscle tightness following the procedure. By easing the tension in the masseter muscles, the treatment can improve overall comfort and quality of life for those with chronic jaw-related symptoms.
There are several treatment options available for managing masseter hypertrophy, each with its own advantages and suitability depending on the patient’s goals, medical history, and tolerance. The choice of treatment should take into account whether the concern is primarily aesthetic, functional, or both.
Common treatment options include:
Each treatment option has specific indications, recovery timelines, and potential side effects. A consultation with an experienced practitioner is essential to determine the most appropriate approach for achieving safe, effective, and lasting results.
Botulinum Toxin jaw reduction provides a versatile solution for individuals looking to improve facial aesthetics and manage jaw-related discomfort. By targeting the masseter muscles, it offers a non-surgical method to contour the jawline, reduce tension, and alleviate symptoms of bruxism and TMD. Its dual-purpose nature, both cosmetic and therapeutic, makes it a sought-after option for patients seeking comprehensive facial care.
As with any medical treatment, it is important to consult a qualified practitioner who understands facial anatomy and can customise the procedure to your specific needs for safe and effective results.
— Dr Moses Ng
Take the first step towards a slimmer jawline and improved comfort. Book a personalised consultation with Dr Ng today to discuss your goals and explore a treatment plan tailored to your facial profile.
Ideal candidates include individuals with enlarged masseter muscles due to bruxism, habitual clenching, or genetic jaw structure. Those seeking facial slimming or relief from jaw tension are also suitable, provided they are in good overall health.
The treatment offers both cosmetic and functional benefits, creating a slimmer jawline while relieving symptoms such as jaw pain, teeth grinding, and tension headaches.
The procedure is well-tolerated by most patients. A numbing cream is applied beforehand, and any discomfort from the injections is usually minimal and brief.
Results typically last between 4 to 6 months, with many patients noticing longer-lasting effects after multiple sessions as the muscles gradually weaken.
Side effects are rare but may include mild swelling, bruising, or temporary jaw weakness. These typically resolve within a few days. A qualified practitioner will assess your suitability and minimise risks.
Visible slimming effects usually appear within 4 to 6 weeks, with full results developing as the muscle relaxes and gradually reduces in size.
Yes, it can be safely combined with other aesthetic or dental treatments, such as chin fillers or bite correction, depending on your individual goals and treatment plan.
Dr. Moses Ng is a distinguished professional in the field of aesthetic medicine, renowned for his expertise in advanced cosmetic procedures. With over 15 years of experience, extensive training and a keen eye for detail, Dr. Ng specializes in a wide range of treatments, including injectables, laser therapies, and acne scar management.
Dr. Moses Ng’s commitment to excellence and patient-centric approach have earned him a reputation as a trusted clinician in aesthetic medicine. His continuous pursuit of the latest advancements in the field ensures that his patients receive the highest standard of care and the most effective treatments available.
