Square jaw Botox has become a hot word for many people who pursue a delicate small face. Square jaw refers to "square jaw". Some people are born with square faces because of the bones of the face, and some are due to acquired habits.
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Acquired square faces are mostly caused by hypertrophy of the masseter muscle, which makes the facial lines appear rough. Square faces make the face wide, the jaw is angular, and lacks softness.
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Botox is widely used in medical beauty. As for Botox, everyone knows that it can be used to remove wrinkles on the facial skin, but Botox can also relax the masseter muscle through injection to achieve the purpose of thinning the face and adjusting the facial contour.
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Compared with traditional bone cutting surgery, square jaw Botox is definitely safer and has a shorter recovery period. Traditional surgery will leave more serious side effects and is difficult to repair later.
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This article introduces the working principle and injection process of square jaw Botox to help you better understand this treatment.
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What is the principle of square jaw Botox?
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Botulinum toxin is essentially a nerve blocker, which can temporarily make the target muscle lose its contraction ability after injection.
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When used to reduce masseter muscle, the doctor will accurately inject botulinum toxin into the masseter muscle, causing it to gradually relax and lose strength, thus shrinking and shrinking.
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As the masseter muscle volume is reduced, the originally square face shape will become softer, presenting an ideal V-face effect.
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This principle is very suitable for people with non-bone masseter hypertrophy. Within 1-3 months, the masseter muscle volume is significantly reduced, the facial contour is clearer, and the overall temperament will appear more refined.
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Unlike other plastic surgery methods, square jaw Botox does not involve bone cutting and will not affect work and life.
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Who is suitable for square jaw Botox?

Square jaw Botox is not suitable for everyone. It is aimed at people with muscular square face or masseter hypertrophy, not bone wide face. The following groups are especially suitable:
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People with hypertrophic masseter muscles: For example, long-term love of eating hard food (such as nuts, beef jerky), chewing gum, and grinding teeth at night will lead to overdevelopment of masseter muscles, resulting in a wide lower half of the face and a stiff contour.
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People who want to improve their jawline:Â Many people find that their jaw angle is protruding and their face is wide when looking in the mirror from the front or side, and hope to obtain a smoother jawline contour through non-surgical methods.
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People who are worried about surgical risks: Compared with bone cutting surgery, which is more traumatic and has a long recovery period, square jaw Botox is non-invasive, safe, and does not require rest. It is suitable for office workers or students who do not want to bear the risks of surgery.
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People who have requirements for photogenic appearance: Live broadcast practitioners, models, actors, etc. have higher requirements for facial contours, and often use Botox to shape photogenic faces to make the face more three-dimensional and coordinated.
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When doctors judge whether injection is suitable, they generally ask patients to clench their teeth tightly and observe the size and distribution of the masseter muscles by hand or instrument to determine whether the masseter muscles are hypertrophic and formulate corresponding plans.
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Detailed Explanation of the Injection Process
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Although square jaw Botox is a minimally incisive treatment project, it still requires professional operation procedures. The injection steps are as follows:
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Initial diagnosis and evaluation: The doctor will ask in detail about the medical history, medication history, and allergy history, evaluate the degree of facial muscle development, and make personalized judgments based on the facial bone structure. The thickness of the masseter muscle will also be confirmed by palpation, photography, or ultrasonic instruments.
Marking the injection point: Let the patient bite his teeth to confirm the protruding position of the masseter muscle and mark it on both sides of the cheek. According to the shape and direction of the masseter muscle, 2-5 injection points are generally selected.
Anesthesia and ice compress: Although the injection process is almost painless, doctors usually use surface anesthetic cream or ice compress to make patients more comfortable.
Formal injection: Use an ultra-fine needle to inject a certain dose of botulinum toxin into the marked area, about 25-40 units on each side, depending on the size of the masseter muscle. The whole process takes about 5-10 minutes.
Postoperative guidance: Detailed care suggestions will be provided after the injection, including avoiding hot compresses, massage, prone position, etc., to ensure that the drug is evenly distributed and effective.
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The whole process is fast and efficient. Many customers can complete the injection during lunch break and go to work as usual in the afternoon.
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Square Jaw Botox Effect: Speed & Longevity

Square jaw Botox is not an immediate project. Its effect has a gradual process:
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Within 1 week after procedure: Most people will feel a slight weakness in the masseter muscle, and their expression and eating are not significantly affected.
2-4 weeks after procedure:Â The jawline of the face gradually becomes softer and the face shape changes significantly. At this time, many customers will be surprised to find that the facial proportions are more natural and the photogenic effect is better when taking pictures.
1-3 months after procedure: The best face-lifting state is achieved, the masseter muscle becomes significantly smaller, the V-shaped face begins to appear, and the whole person appears more friendly.
Maintenance time:Â The effect of the first injection lasts about 4-6 months, and individual differences are large. If injected 2-3 times in a row, the muscle will gradually "memory atrophy", and it is not easy to rebound even if the injection is stopped.
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Regular injections can significantly prolong the effect. Some people can maintain long-term face-lifting effects by injecting once a year.
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Side Effects and Precautions of Square Jaw Botox
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Although Square Jaw Botox is relatively safe, it is an injection-based project and may still cause some discomfort or side effects. It is very important to understand and deal with them correctly:
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Common side effects:
- Local swelling and bruising: After injection, some parts may experience slight swelling or bruising of the needle hole, which usually disappears on their own within a few days.
- Weak and weak masseter muscles: After the masseter muscles become smaller, they may temporarily affect chewing hard food, and the adaptation period is 1-2 weeks.
- Face stiffness or asymmetry: If the injection dose is uneven or the technique is improper, it may cause asymmetry of the left and right faces or a stiff smile.
- Affecting speech or swallowing (very rare): When the injection is too deep, other muscle groups may be accidentally injured, causing temporary discomfort.
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Precautions:
- Avoid lying down, massaging the face, drinking or strenuous exercise on the day of injection.
- Avoid high temperature environments, such as saunas and steam baths, within 3 days after surgery.
- Avoid chewing a lot (such as chewing gum and nuts) within one week to prevent interference with the efficacy of the drug.
- If asymmetry occurs, follow-up treatment should be carried out in time, which can generally be improved by supplementary injections.
- Choosing a formal institution and experienced doctors is the key to reducing risks and ensuring results.
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Real Cases of Square Jaw Botox Injection
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28-year-old female, self-media anchor
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This customer has high requirements for face shape because she faces the camera all year round. The original masseter muscle caused the face to be wide, which affected the photogenic effect. One month after the injection of Botox, the face shape was obviously tightened, and it was more delicate and three-dimensional in the camera. Fans said that she looked more and more like a star. The second injection was 6 months apart, and the effect was maintained well, and the customer was very satisfied.
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Case 2: 35-year-old male, sales manager
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Due to the need to meet customers frequently for work, the man wanted to improve his personal image. Diagnosed with a large square face with masseter hypertrophy, the face became refreshed and capable after the first injection, and the temperament was significantly improved after changing the hairstyle. The customer said that "the business order rate is high."
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Difference between square jaw Botox and bone reduction surgery
Project |
Square Jaw Botox |
Mandibular Angle Bone Reduction Surgery |
Type |
Non-surgical injection |
Surgical procedure |
Suitable for |
Masseter hypertrophy |
People with wide bone structure |
Risk |
Low risk, no recovery period required |
High risk, requires anesthesia and recovery time |
Time for Effect to Appear |
Gradual, around 1–3 months |
Immediately visible |
Effect Duration |
4–6 months; regular injections extend it |
Permanent (but higher risk) |
Cost |
Relatively low; hundreds   Dollars |
Expensive; surgery costs tens of thousands dollars |
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Frequently Asked Questions
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Q1: Is it enough to inject only once?
A: It depends on the size of the individual masseter muscle. For most people, the effect weakens about 4-6 months after the first injection. It is recommended to inject 2-3 times in a row to achieve a more stable and long-term face-lifting effect.
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Q2: Will more injections affect facial expressions?
A: No. As long as it is operated by a professional doctor and avoids the expression muscle area, it will not affect the smile or natural expression.
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Q3: What projects can be combined with?
A: It is often used in combination with chin filler (hyaluronic acid), facial thread sculpture, facial lipolysis needle, etc. to comprehensively enhance the three-dimensional and contour sense of the face.
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Conclusion
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Square Jaw Botox is an efficient, safe, and non-invasive facial contour management solution, especially suitable for young people with hypertrophy of the masseter muscle. Of course, the effect depends largely on the doctor's professional judgment and operation experience. It is recommended to choose a regular institution and a qualified doctor for treatment to achieve an ideal and safe V-face effect.
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Diaminy provides meso needles and insulin needles for Botox injections. The needles are sharp and made of stainless steel, with guaranteed quality.
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