
The masseter muscle is a set of powerful muscles that help us chew and eat our food. An enlarged masseter muscle is often caused by overworking the muscle through habits such as gum chewing, teeth grinding, or clenching. This can result in a wider jaw and a more masculine or bottom-heavy appearance. While it is not a life-threatening condition, it can cause psychological distress and pain. There are several ways to reduce the masseter muscle, including conservative/non-surgical therapies, behaviour therapy, and injectable treatments. Jaw exercises can also help to relax and loosen the muscles, providing short-term pain relief.
How to reduce jaw muscle
| Characteristics | Values |
|---|---|
| Cause | Overuse, teeth grinding, TMJ disorders, genetics |
| Non-surgical treatments | Splint therapy, behaviour therapy, Botox injections |
| Surgical treatments | Removal of part of the masseter muscle and jawbone, liposuction |
| Jaw exercises | Neck curl-ups, tongue twisters, resisted closing, partial and full opening |
| Diet and lifestyle changes | Reducing gum chewing, addressing stress and anxiety, eating soft foods |
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What You'll Learn

Botox injections to relax the jaw muscles
Botox injections are a popular treatment option for reducing jaw muscles and relieving jaw tension. The injections contain botulinum toxin, which is injected directly into the masseter muscle—the muscle responsible for chewing and elevating the lower jaw. When injected, the botulinum toxin blocks the nerve signals and neurotransmitters that tell the masseter muscles to contract, essentially "freezing" the muscle and preventing it from moving involuntarily. This relaxation effect helps to alleviate tension and pain along the jawline, making it particularly useful for treating TMJ (temporomandibular joint) disorders and teeth grinding (bruxism). Botox can also help minimise lockjaw and eliminate headaches resulting from teeth grinding.
Botox injections for jaw reduction are performed in a doctor's office and do not require hospitalisation. Before the procedure, a medical professional will conduct a consultation to understand the patient's goals and concerns and examine their jaw and face to determine the injection site and the number of syringes needed. During the procedure, the doctor will clean the skin to reduce the risk of infection and may apply topical anaesthesia to numb the area. The syringe, equipped with a very thin needle, is then inserted into the masseter muscle, delivering the botulinum toxin.
The muscle tenderness associated with the injections typically dissipates almost immediately, and the patient can usually resume their normal activities. However, it is important to follow the doctor's instructions to prevent the toxin from spreading to other muscles. Patients may experience mild temporary redness, bruising, or numbness around the injection sites. The wrinkles and fine lines in the treated area may take a few days to a week to fully disappear.
While Botox is a popular and effective treatment for reducing jaw muscles and relieving jaw tension, it is important to consult with a qualified cosmetic surgeon or medical professional to understand the potential risks and side effects. It is also crucial to avoid Botox injections during nursing, pregnancy, and lactation.
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Mouth guards to prevent teeth grinding
Involuntary teeth grinding, or bruxism, is a common condition that often occurs during sleep. It can cause tooth pain and jaw pain, and is sometimes associated with TMJ disorders. Teeth grinding can also lead to an enlarged masseter muscle, which is one of the four pairs of muscles used for chewing. This can result in a wider jaw and a more square-angled or masculine face.
To prevent teeth grinding, dentists can provide mouth guards, which are a form of oral protection worn during sleep. These guards are typically made of soft plastic or hard acrylic and fit over the upper or lower teeth. Custom-made night guards provide added protection against grinding compared to generic or over-the-counter guards, as they are designed specifically for the shape of the user's mouth. They are more comfortable and secure, and less bulky and uncomfortable to wear for long periods.
Night guards work by forming a protective barrier between the upper and lower teeth, preventing them from grinding against each other. This not only protects the teeth from damage but also helps to alleviate associated headaches, jaw pain, and discomfort. By reducing teeth grinding, night guards can improve overall sleep quality, helping individuals wake up feeling refreshed instead of groggy and in pain.
There are several options available for purchasing night guards, ranging from custom-made guards from dentists to over-the-counter options. Custom night guards from dentists can be expensive, but companies like ClearClub offer more affordable custom-fit solutions that are equally effective and comfortable. Over-the-counter options, such as those available at Walmart, are also more affordable but may be less comfortable due to their one-size-fits-all design.
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Jaw exercises to strengthen and relax the jaw
Jaw exercises are an effective way to strengthen and relax the jaw muscles, which can help improve the appearance of the jawline and prevent issues such as neck pain, headaches, and jaw pain. Here are some exercises that can help:
Neck Curl-ups
Lie on your back with your tongue pressed against the roof of your mouth. Bring your chin to your chest and lift your head about 2 inches off the ground, ensuring your stomach remains relaxed and your chin is not poking out. Start with 3 sets of 10 repetitions, gradually increasing over time. This exercise can also be done while seated or standing.
Tongue to Roof
Place your tongue on the roof of your mouth, just behind your upper front teeth, and allow your jaw to relax as your mouth opens naturally. This exercise helps to release any tension in the jaw.
Jaw Stretch
Gently stretch your jaw by opening your mouth as wide as you comfortably can while looking up. Hold this position for a few seconds, then slowly close your mouth. Repeat this exercise a few times.
Side-to-Side Jaw Movement
With your mouth open and your teeth slightly apart, move your jaw to the left and hold for a few seconds. Repeat on the right side. Ensure that you only move your jaw and keep your neck and head still.
Resistance Exercise
Place your hand under your chin to create resistance. With your hand in place, open your mouth as wide as you can while pushing down gently. Hold this position for a few seconds, then relax.
In addition to these exercises, it is important to address any habits that may contribute to overworking the jaw muscles, such as gum chewing, teeth grinding, or clenching. Reducing these activities and managing stress can help prevent the enlargement of the masseter muscles and improve jaw relaxation.
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Avoid gum chewing to reduce masseter muscle strength
Chewing gum is an easy way to improve masticatory muscle function and strength. However, it can lead to an enlarged masseter muscle, which is one of the muscles used for chewing. This condition is called masseter muscle hypertrophy and it can cause a square-shaped or bottom-heavy jaw, which may be undesirable, especially for women.
Masseter muscle hypertrophy is often caused by overworking the muscle through repetitive habits such as gum chewing, emotional stress, or chronic clenching and grinding of the teeth. This can be unconscious, so many are not aware of these habits. Therefore, avoiding gum-chewing can help to reduce masseter muscle strength and prevent hypertrophy.
If you are experiencing masseter muscle hypertrophy due to gum chewing, reducing or stopping this activity will usually lead to a reduction in muscle size over time. However, it is important to note that this is not always the case, and there are other factors that can contribute to masseter muscle hypertrophy, such as emotional stress, genetics, and teeth grinding.
There are other treatments available for masseter muscle hypertrophy, including conservative or non-surgical therapies, such as splint therapy, behaviour therapy, and botulinum toxin type A (Botox) injection therapy. The traditional method of treatment is surgery to remove part of the masseter muscle and jawbone or liposuction of the fat near the muscle.
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Behavioural therapy to address habits that overwork the jaw
Behavioural therapy can be an effective way to address habits that overwork the jaw. This type of therapy can help individuals become aware of and change behaviours that contribute to masseter muscle hypertrophy. Masseter muscles are a set of powerful muscles that help us chew and eat our food. They are used for the elevation and forward movement of the lower jaw.
Habits such as clenching or grinding teeth, chewing gum, biting nails, or chewing on objects like pens can lead to overworked masseter muscles. Many of these habits are unconscious, and individuals may not be aware of them. Behavioural therapy can help address these habits through techniques such as habit reversal training. This type of training involves several key elements:
- Awareness training: This involves bringing greater attention to behaviours such as clenching or grinding. Individuals may be asked to observe themselves in a mirror and describe their behaviours in detail, helping them gain better self-control.
- Development of a competing response: Here, individuals learn to develop alternative responses to their habits. For example, if an individual feels the urge to clench their jaw, they may be taught to relax their jaw and face muscles instead.
- Motivation building: This element focuses on building the individual's motivation to change their habits.
- Relaxation training: Techniques such as meditation, deep breathing, or progressive muscle relaxation can help individuals manage stress and reduce jaw clenching or grinding.
- Generalization of new skills: This involves applying the skills learned in therapy to various situations and environments, such as at home, work, or in public places.
In addition to habit reversal training, other types of behavioural therapy, such as cognitive-behavioural therapy (CBT) or dialectical behaviour therapy (DBT), may also be beneficial. These therapies can provide individuals with tools to manage stress and address the underlying causes of their jaw-overworking habits.
Behavioural therapy can be an effective approach to reducing jaw muscle overwork and the associated symptoms, such as jaw pain and TMJ disorders. It empowers individuals to recognize and change their habits, leading to improved oral health and overall well-being.
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Frequently asked questions
There are several factors that can cause jaw muscles to become enlarged, including:
- Overuse, such as from frequently chewing gum
- Teeth grinding, which can be caused by stress or anxiety
- Genetics
- Ageing
- Arthritis
There are a few ways to reduce jaw muscles without resorting to Botox or other injectable treatments. These include:
- Behaviour therapy: Addressing behavioural habits that may be contributing to overworking the jaw muscles, such as teeth grinding or gum chewing
- Mouth guards: These can help prevent teeth grinding and reduce the strain on jaw muscles
- Jaw exercises: Relaxing and stretching the jaw muscles through various exercises, such as tongue placement and jaw curls
- Dietary changes: Eating soft foods can help when jaw muscles are stiff and tight
A non-surgical jaw reduction procedure offers several advantages over traditional surgery, including:
- No surgery required: Botox injections can effectively reduce the size of jaw muscles without the need for invasive procedures
- Quick results: Visible results can be seen within two weeks of treatment
- Minimal recovery time: These simple injections do not require a lengthy recovery period
- Long-lasting results: The effects of the treatment can last up to six months











































