Logan Steele
The masseter muscle is a powerful muscle that plays an important role in our ability to chew and eat food. It is located on both sides of the face and is responsible for clenching the teeth and moving the jaw. While it is essential for our daily functioning, overuse of the masseter muscle can lead to hypertrophy, or enlargement, resulting in a square-shaped jawline. This condition, although usually asymptomatic, can cause aesthetic concerns, particularly for those seeking a more feminine facial appearance. Additionally, overworked masseter muscles can lead to pain and functional disorders of the jaw. Treatment options range from conservative therapies, such as behaviour therapy and splint therapy, to surgical procedures like liposuction or partial muscle removal. Botox injections are also commonly used to reduce the size of the masseter muscle and alleviate associated symptoms.
| Characteristics | Values |
|---|---|
| Condition | Masseter Muscle Hypertrophy |
| Description | Enlargement of the masseter muscle |
| First Described | In 1880 by an English physician named JW Legg |
| Age Group | Typically observed in adults aged 20-40 years |
| Gender | No gender predominance |
| Appearance | Square-angled face, creating a more masculine look or a bottom-heavy appearance |
| Unilateral/Bilateral | Can be either unilateral or bilateral |
| Symptoms | Pain, clenching/grinding, and functional disorders of the jaw |
| Causes | Emotional stress, chronic clenching/grinding, repetitive habits like gum chewing, preference for chewing on one side |
| Diagnosis | Clinical history, physical examination, imaging (CT scans, MRI scans), muscle palpation |
| Treatment | Conservative (splint therapy, behavior therapy, Botox injections), Surgical (masseter muscle/jawbone removal, liposuction) |
| Prevention | Healthy lifestyle, diet, and exercise |
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What You'll Learn
Causes of a big masseter muscle
The masseter muscle is one of the muscles responsible for mastication, or chewing. It is found in mammals, and is particularly powerful in herbivores to help them chew plant matter. In humans, the masseter muscle is one of the strongest, if not the strongest, muscle in the body.
Masseter muscle hypertrophy refers to the enlargement of the masseter muscle. This condition was first described in 1880 by an English physician named JW Legg. It is considered a rare condition and the exact cause is often unknown. However, there are some common factors that can contribute to overworking the masseter muscles, such as emotional stress and chronic clenching or grinding, either during the day or while sleeping. Other factors include repetitive habits like gum chewing or a preference for chewing on one side.
The masseter muscle can be enlarged in patients who habitually clench or grind their teeth, even in those who constantly chew gum. This masseteric hypertrophy is usually asymptomatic and soft, and it can be unilateral or bilateral. Even if the hypertrophy is bilateral, asymmetry of the face may still occur due to unequal enlargement of the muscles. This condition can also be confused with parotid salivary gland disease, dental infections, and maxillofacial neoplasms.
If you think your jaws are too wide, Botox can be placed in the masseter muscle to slim the face. However, it is important to consult with an experienced Botox injector to evaluate your jaw and determine the best course of treatment. Other non-surgical therapies include splint therapy, which uses an oral appliance to help decrease biting forces from clenching and grinding, and behavior therapy, which helps address behavioral habits that may be contributing to overworking the masseter muscles.
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Diagnosis of masseter hypertrophy
Masseter muscle hypertrophy refers to the enlargement of the masseter muscle. This condition was first described in 1880 by an English physician named JW Legg. It is considered a rare condition and the true cause is often unknown. It is typically observed in adults aged 20-40 years, with no gender predominance, and can be unilateral or bilateral.
In addition to physical examination, diagnostic imaging may be used to confirm the diagnosis and rule out other potential causes of facial swelling, such as muscle tumors, salivary gland disorders, or other growths in the head and neck region. Imaging modalities such as panoramic X-rays, CT scans, and MRI scans can provide excellent visuals for diagnosing various masseter muscle conditions.
Once a diagnosis of masseter hypertrophy is confirmed, treatment options can be considered. Conservative or non-surgical therapies include splint therapy, behavior therapy, and injection of botulinum toxin (Botox, Xeomin, Dysport). Surgical treatments, on the other hand, involve the removal of a portion of the masseter muscle and jawbone or liposuction of the fat near the muscle under general anesthesia.
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Masseter hypertrophy treatment options
Masseter hypertrophy is an uncommon disorder that can cause aesthetic and functional problems. It is characterized by benign enlargement of the masseter muscle volume. The masseter muscle is one of the largest muscles in the face and plays an important role in aiding jaw movement and
There are two main approaches to treating masseter hypertrophy: conservative/non-surgical therapies and surgical treatments.
Conservative/Non-Surgical Therapies:
- Splint Therapy: This involves the use of an oral appliance to help decrease biting forces from clenching and grinding.
- Behavior Therapy: This approach focuses on addressing behavioral habits that may contribute to overworking the masseter muscles. It includes techniques for relaxation, stress management, thermal therapy, sleep hygiene, and dietary counseling.
- Botulinum Toxin Injections: Also known as Botox, this is a minimally invasive and conservative treatment method. It is often considered one of the most effective options for treating an overgrown masseter and slimming the face. The injections cause muscle atrophy by blocking neurotransmission, leading to a reduction in muscle bulk and improvement in facial symmetry.
Surgical Treatments:
- Surgical Resection: This involves the surgical excision or reduction of the enlarged masseter muscle and/or bone. It is a more invasive option and may be considered when the conservative approach does not provide satisfactory results.
- Bone Reshaping: In some cases, surgical treatment may also involve reshaping the bone tissue in the angular region to reduce the overall width of the jaw.
It is important to note that the treatment plan should be decided in consultation with a qualified healthcare professional, who can assess the patient's specific needs and recommend the most suitable option.
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Botox for masseter reduction
The masseter muscle is one of the most powerful muscles in the human body and is responsible for elevating and moving the lower jaw forward to enable chewing. The muscle can become enlarged due to overwork from habits such as teeth grinding and clenching, gum chewing, and nail-biting. While this condition is not life-threatening, it can cause psychological distress due to the change in facial appearance, such as a square-angled or bottom-heavy jaw.
Botox injections are a popular treatment option for reducing the size of the masseter muscle and slimming the face. Botox is typically used as a muscle relaxer and anti-aging treatment to reduce wrinkles and fine lines. However, when injected into the masseter muscle, it can help manage pain caused by teeth grinding and reduce the width of a protruding jawline, improving facial harmony.
The procedure involves injecting Botox into the masseter muscle, targeting the belly of the muscle on the side of the face and a precise injection point where the muscle inserts into the bone. This weakens the muscle over time, leading to a reduction in size. The amount of Botox needed ranges from 20 to 30 units per side, depending on the muscle's thickness, and a second treatment may be required after three months to maintain the desired results.
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Jaw pain and migraines
The masseter muscle is the thick muscle that connects the jawbone and cheekbone and is the primary muscle for chewing. It is also the main muscle that clenches the jaw and grinds the teeth. When the masseter muscle tightens up due to stress or teeth grinding, it can trigger a chain reaction that restricts other muscles in the head and neck, resulting in tension headaches.
Masseter muscle pain can be distressing and disruptive to essential functions such as chewing, talking, and even smiling. The pain is often caused by tension, which may be due to emotional stress, physical factors like malocclusion and bruxism, or regular habits like constant chewing or gum chewing.
To alleviate masseter muscle pain and tension, various treatments are available, including conservative interventions and more expensive, invasive options:
- Conservative interventions: Physical therapy, including masseter muscle massage, can be effective in treating jaw pain and tension headaches. Massage targets trigger points, or muscle "knots," that are common sources of strange aches and pains.
- Invasive options: More expensive and invasive treatments include Botox injections, custom-fitted mouthpieces, and surgery. Botulinum toxin (Botox) injections are considered safe and effective for both therapeutic and cosmetic purposes.
In addition to seeking professional treatment, self-care strategies can also be employed to manage masseter muscle pain and tension:
- Manual therapy: Applying pressure to the masseter muscle by pressing in with both hands on the sides of the jaw bone and holding for 5-10 seconds can help release tension.
- Acupuncture and dry needling: These techniques can effectively treat trigger points in the masseter muscle.
- Gentle exercises: Specific exercises can address the true cause of pain and decreased function by identifying and treating weak and tight muscles, joint restrictions, and movement pattern issues.
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Frequently asked questions
Put your fingers on the back of your jawbone and cheek. Clench your teeth like you are chewing. If you feel a big lump, you may have a big masseter. Other signs include a square jaw, a wide face, and a masculine appearance.
The masseter muscle is like any other muscle in the body: the more you use it, the stronger and larger it becomes. Common factors that can contribute to overworking the masseter muscles include emotional stress, chronic clenching or grinding, gum chewing, and a preference for chewing on one side.
No, a big masseter muscle is not dangerous or life-threatening. However, it can cause psychological distress due to the change in facial appearance. Additionally, it can be a source of pain and discomfort, especially in the jaw and with migraines.
There are both conservative and surgical treatments for a big masseter muscle. Conservative treatments include splint therapy, behavior therapy, and botulinum toxin (Botox) injections. Surgical treatments involve removing part of the masseter muscle and jawbone or performing liposuction near the muscle.
