Square Jawline (Masseter)


The masseters are large muscles on each side of the face, connecting the cheek bone to the lower end of the jaw bone. They are used when for chewing food but may be overactive. This more frequently appears in people who clench their jaws when stressed, grind their teeth, or those that frequently chew gum. These activities can lead to enlargement of these muscles and cause a square jawline .

Overactivity and associated enlargement of these muscles not only gives a square appearance to the lower face. It can also damage the teeth, cause jaw pain and result in temporo-mandibular joint dysfunction (tmj). Neuromodulators such as Botox, Dysport and Xeomin can help reduce muscle tension and overactivity and thereby provide relief.

People with wide jaws may narrow their jaw line by diminishing the size of the masseter muscles. Treatments include, Botox, Xeomin, or Dypsort.

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