CONCERNS
Wide/Square Jaw
AcA wide or square jawline is commonly caused by enlargement of the masseter muscles, the muscles located at the back of the jaw that are responsible for chewing. While some individuals naturally have a broader lower face due to genetics, others may develop a more prominent jawline as a result of teeth grinding (bruxism), jaw clenching or excessive chewing. In some cases, enlarged masseter muscles can create a wider facial appearance and reduce the definition of a V-shaped facial contour. Treatment focuses on reducing excessive muscle bulk and refining the overall shape of the lower face.
Understanding A Wide / Square Jawline
What Is A Wide Or Square Jawline?
A wide or square jawline is often associated with enlarged masseter muscles, a condition known as masseter hypertrophy. The masseter muscles sit at the angle of the jaw and play an important role in chewing and biting.
When these muscles become overdeveloped, they can create a broader, more angular appearance in the lower face. This is particularly common among individuals of East Asian descent and may be influenced by genetics, lifestyle habits and muscle activity.
Common Causes
Genetics
Some individuals naturally have a broader jawline due to inherited facial structure and stronger masseter muscles.
Teeth Grinding (Bruxism)
Repeated clenching and grinding can cause the masseter muscles to become enlarged over time.
Jaw Clenching
Frequent jaw tension may contribute to muscle enlargement and increased jaw width.
Excessive Chewing
Habitual gum chewing and repetitive chewing activities may increase masseter muscle activity.
At-a-Glance
Treatment Approach
The Rexults Approach To Wide / Square Jawlines
At Rexults, treatment begins with determining whether jaw width is caused primarily by enlarged muscles, bone structure or a combination of factors. For patients with masseter hypertrophy, treatment focuses on reducing excessive muscle activity to refine the lower facial contour.
Assess
We assess your facial anatomy, jawline shape and masseter muscle activity to determine whether muscle enlargement is contributing to a wider facial profile.
Personalise
A personalised treatment plan is developed based on your facial proportions, muscle strength and desired jawline definition.
Refine
Botulinum Toxin is precisely administered to relax the overactive masseter muscles, gradually softening the jawline and refining the lower facial contour.
Balance
As the masseter muscles gradually reduce in size, the jawline appears slimmer, softer and more harmonious while maintaining natural facial proportions.
Recommended Treatments
Botulinum Toxin
Botulinum Toxin may be injected into the masseter muscles to temporarily reduce muscle activity. As the muscle gradually becomes less active, it may reduce in size over time, creating a slimmer lower facial profile and a softer jawline appearance. This is the primary Rexults treatment recommendation for wide or square jawlines caused by masseter hypertrophy.
Suitable For
Masseter hypertrophy
Wide lower face
Square jawline
Teeth grinding (bruxism)
Jaw clenching habits
Frequently Asked Questions
Clinical Perspective
Every patient presents with unique concerns, anatomy, skin quality and treatment goals. At Rexults, every recommendation begins with a comprehensive medical assessment, allowing us to develop a personalised treatment plan that addresses the underlying cause of the concern rather than simply treating its visible signs. Depending on your individual needs, treatment may involve a single procedure or a carefully tailored combination approach to achieve safe, natural and long-lasting results.
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A square jawline may be caused by genetics, enlarged masseter muscles, teeth grinding, jaw clenching or facial bone structure.
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Masseter hypertrophy refers to enlargement of the masseter muscles, which can create a broader and more angular lower face
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Yes. Chronic teeth grinding and jaw clenching can overwork the masseter muscles, causing them to enlarge over time
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Not necessarily. If the width is primarily caused by enlarged masseter muscles, non-surgical treatment with Botulinum Toxin may be appropriate.
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Results typically develop gradually and may last several months before maintenance treatment is considered
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When appropriately performed, treatment is designed to reduce excessive muscle activity while preserving normal jaw function. A consultation is required to determine suitability and discuss expected outcomes