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The concern that your face looks square from the front actually divides into two different causes. There are cases where bone (mandibular angle) overdevelopment is the cause and cases where masseter muscle (chewing muscle) overdevelopment is the cause. Even though these two may look similar on the surface, the appropriate approach differs completely, so understanding your type first is the starting point.
TLDR — 3-Line Summary
• Skeletal type: The jaw bone line looks wide even at rest → Consider long-curve square jaw resection surgery
• Muscle type: When clenching teeth, jaw muscle becomes noticeably prominent → Review botulinum toxin (Botox) first
• Mixed type: Both bone and muscle apply → Surgery followed by Botox to refine contours is possible
Why Does Your Face Look Square from the Front — The Most Frequently Asked Question in Gangnam
The reason your face looks unusually wide and angular from the front can be found in the lower jaw structure. Square jaw is largely divided into two causes. The first is when the mandibular angle, the angular part of the lower jaw bone (mandible), is overdeveloped, and the second is when the masseter muscle (chewing muscle) used when eating grows hypertrophied. According to Sidae Health data, these two causes often coexist, making it difficult to distinguish accurately by appearance alone.
The contour of the jaw line affects not only the jaw area but also significantly impacts the overall first impression and image formation of the face. In a report by Economy Science, it was also mentioned that the width and contour of the lower face significantly influence the overall facial proportion impression.
In summary, determining first whether your square jaw is caused by bone, muscle, or both is the first step in deciding between surgery and non-surgical treatment. Below, we examine specific approaches for each type.
Square Jaw Approach by Cause — Cases Requiring Long-Curve Surgery vs. Cases Where Botox Suffices
The choices differ depending on the cause. Refer to the comparison table below to first check which type is closer to yours.
Classification | Skeletal Type (Bone Overdevelopment) | Muscle Type (Masseter Hypertrophy) |
|---|---|---|
Primary Cause | Mandibular angle and jaw bone itself are wide | Masseter (chewing muscle) abnormally developed |
Recommended Approach | Long-curve square jaw resection surgery (facial contour surgery) | Botulinum toxin (Botox) injection or masseter reduction surgery |
Durability | Semi-permanent (bone structure itself changes) | Semi-permanent; Botox requires repeated treatment at 4-6 month intervals |
Limitations | General anesthesia and recovery period required | Limited effectiveness for bone structure problems |
Combination Options | Can add Botox after surgery to refine contours | If muscle type alone, approach with masseter reduction rather than contour |
According to related medical information, when the jaw bone itself is wide or the mandibular angle is severely developed, visible changes may be limited with Botox alone. In Idalbogeongang data, surgical methods are noted as more fundamental solutions for bone-type square jaw.
Conversely, botulinum toxin injection works by temporarily blocking nerve signals transmitted to the masseter muscle, inducing the hypertrophied muscle into a relaxed state. According to Sidae Health data, the effects gradually appear over weeks to months, and as a result, you can expect the lower face to appear slimmer.
Also, Idalbogeongang introduces a method of combining masseter reduction surgery or masseter Botox after bone surgery to refine the jaw line more naturally, which is utilized in clinical practice. Even if you have a skeletal type, if the masseter has also developed together, it may be difficult to achieve complete contours with surgery alone, and this combination method can be a complementary approach.
21plastic surgery's Square Jaw Long-Curve Surgery — Design Points That Determine Front Effects
Long-curve square jaw resection surgery resects from below the ear to the front chin in one smooth curve. Unlike conventional simple square jaw resection that only removes the angular part below the ear and can result in secondary angles or uneven jaw lines, the long-curve method is designed as a long curve extending from the mandibular angle to the front chin, minimizing such problems. The Economy Science report also explains that 'long-curve square jaw surgery' is applied to prevent secondary angles and anterior open bite phenomena.
Another point that increases front effects is outer cortical bone resection. According to related clinical data, when the outermost outer cortical bone of the jaw bone is additionally refined, the thickness of the bone itself decreases, allowing the face that looked wide from the front to appear slimmer with added reduction effects. It's good to confirm during consultation whether this aspect is included in the surgical plan.
What determines surgical results is not simply 'how much you shave off' but harmony with overall facial proportion. 21plastic surgery approaches square jaw long-curve surgery as part of three contour procedures (malar reduction, square jaw long-curve, and chin advancement) from a total aesthetic surgery perspective that first considers individual facial harmony — only what is needed where it is needed. The way to look at how the proportions of the cheekbone, square jaw, and chin connect to each other directly results in the face appearing natural after surgery.
Is My Square Jaw a Bone Problem or a Muscle Problem? — Conditions You Must Check Before Surgery
You can gauge your basic type before consultation. Check the checklist below.
• Muscle Type Signals (Review Botox First)
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When clenching teeth, jaw muscle protrudes noticeably
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You have a habit of chewing a lot or have bruxism
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When relaxed, the jaw doesn't look that wide
In clinical cases, botulinum toxin is known to be effective for muscle development types where muscles bulge when clenching teeth.
• Skeletal Type Signals (Consider Surgery)
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Even at rest with no force, the jaw bone line itself looks wide
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The lower face width doesn't change significantly whether teeth are clenched or not
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From the side, the jaw bone angle feels distinctly pronounced
DoctorNow Medical Q&A also states that when square jaw is due to bone structure, Botox alone has limitations, and surgical methods should be considered in such cases.
• Additional Conditions to Confirm Before Surgery
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If there is a problem with bite (how upper and lower teeth align) → Confirm whether interdisciplinary consultation with oral surgery is needed
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Deep bite (upper front teeth excessively overlap lower front teeth) → Can affect surgical scope and method
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Nerve line (inferior alveolar nerve) position can change resection range, so CT image analysis must precede
• Mixed Type Cases (Consider Surgery + Botox Combination)
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Skeletal type but muscle is also prominent when clenching teeth
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After contour surgery, manage remaining masseter volume with masseter reduction surgery and Botox
Residents near Gangnam areas such as Seocho, Yeoksam, and Nonhyeon can also easily access clinics located between Shinnonhyeon Station and Gangnam Station, and can begin by identifying your square jaw type.
To Change the Square Front Face, First See the Cause Accurately
21plastic surgery located between Shinnonhyeon Station and Gangnam Station begins with a diagnosis examining both bone and muscle structure for those concerned about a square front impression, and together we draw a direction for your entire facial proportion to harmoniously transform.
Square jaw improvement starts not with 'how much to reduce' but with 'accurately determining first whether it's bone, muscle, or both.' As emphasized in DoctorNow Medical Q&A, attempting treatment without accurately understanding your square jaw cause can make it difficult to achieve the facial change you expected.
Seoul National University Hospital Medical Information also guides that sufficient diagnosis and surgical planning before facial contour surgery are the key to determining results. Rather than approaching based only on cost or recovery time without accurate diagnosis, first confirming whether it is the right method for your facial structure is the wisest first step.
If you're still unsure whether your square jaw is caused by bone or muscle — bringing that question to knock on the consultation door is the beginning.
Treatment suitability is determined after consultation.
Doubts You Must Resolve Before Square Jaw Surgery
Q1. When I clench my teeth, my jaw muscle pops out. Do I need surgery or is Botox enough?
If your muscle only bulges when clenching and the jaw width significantly decreases when relaxed, you likely have a muscle type. In this case, botulinum toxin is the first consideration. However, if the jaw bone line itself is wide even when relaxed, skeletal type may coexist, making accurate distinction through consultation crucial.
Q2. How much different is the front effect of long-curve square jaw surgery compared to conventional square jaw surgery?
The conventional method resects only the angular part below the ear, and after surgery, secondary angles (new angles) can form in the middle area or the jaw line may appear uneven. The long-curve method is designed as a smooth curve extending from the mandibular angle to the front chin in one go, reducing this problem, and aims for natural lines both from the front and side.
Q3. How long does swelling take to completely subside after surgery?
According to Seoul National University Hospital Medical Information, initial swelling after facial contour surgery subsides considerably within 2-4 weeks, but complete recovery and final result confirmation may take approximately 3-6 months. There are differences depending on individual constitution and surgical scope, so it's good to plan important schedules with leeway after surgery.
Q4. Is the effect better if I combine masseter reduction or Botox after square jaw surgery?
In mixed-type cases that are skeletal type but also have developed masseter, correcting the bone structure first with surgery and then additionally managing remaining masseter volume with masseter reduction surgery and botulinum toxin can help refine the contour more naturally. As a concept of supplementing what is not completed by surgery alone, it is not necessary for everyone and is determined after diagnosis.
Treatment suitability is determined after consultation