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Many people seek a slimmer, more contoured face for aesthetic or functional reasons. Masseter reduction—often referred to as a V-line procedure—targets the masseter muscle to soften a square jaw and create a more tapered, oval or V-shaped lower face. The aim is to reduce a prominent jawline by relaxing or reducing the masseter muscle that sits at the angle of the jaw.
This treatment is commonly achieved non-surgically with botulinum toxin (Botox or Dysport) injections that relax the muscle, gradually slimming the lower face over several weeks. As beauty standards and cosmetic options evolve, understanding the history, methods, benefits and limitations of masseter reduction helps you make an informed choice. The following overview explains its development and what to expect from different approaches.
History of Masseter Reduction
Botulinum toxin was first developed and studied for medical uses in the late 20th century. Initially cleared for certain muscle spasm disorders, its ability to temporarily weaken targeted muscles led clinicians to consider cosmetic and functional applications, including reducing the appearance of a bulky masseter muscle. Clinical interest in treating masseter hypertrophy—an enlargement of the chewing muscle that can cause a squared jaw or facial asymmetry—grew in the 2010s, with trials and published reports around 2013–2014 examining safety and effectiveness of injections for this purpose.
Masseter reduction can address not only cosmetic concerns but also symptoms related to overactive jaw muscles, such as jaw pain, tightness, headaches, and bruxism (teeth grinding or clenching). Procedures to reduce masseter prominence range from non-surgical neuromodulator injections that temporarily relax the muscle to surgical options that remove muscle tissue or contour bone for a permanent effect. Because each option carries potential risks, these treatments should be performed by qualified professionals experienced in facial anatomy and aesthetic or reconstructive procedures.
What the Procedure Involves
Non-surgical masseter reduction typically involves a brief series of injections into the masseter muscle. The procedure is usually quick—often taking around 10 to 20 minutes—and may provide noticeable changes over several weeks as the muscle atrophies slightly from reduced activity. Results commonly last three to four months, after which repeat treatments are needed to maintain the effect. Side effects can include localized bruising, temporary weakness of chewing muscles, or mild pain at the injection site; these are generally transient when injections are placed correctly.
For people who prefer non-invasive self-care first, manual techniques such as targeted massage and jaw exercises can help relieve tension and reduce symptoms of muscle overuse. Simple masseter massage—using knuckles or fingers to apply gentle pressure from below the cheekbones down to the jawline—may ease tightness, though it will not permanently change muscle bulk.
Surgical masseter reduction offers a permanent alternative by removing a portion of the muscle or reshaping underlying bone. This approach carries the greater risks and recovery considerations associated with surgery and is typically reserved for patients with significant hypertrophy or those seeking a one-time, lasting change. Preoperative evaluation and careful discussion with a maxillofacial surgeon or experienced plastic surgeon are essential.
Deciding between non-surgical and surgical masseter reduction depends on goals, anatomy, medical history and tolerance for downtime or repeat treatments. A consultation with a qualified specialist can clarify expected outcomes, potential complications and a tailored plan—whether conservative management, injectable neuromodulators, or surgical contouring is most appropriate.