A wide jaw is often due to genes, having naturally large masseter muscles, the muscles in the lower jaw we use for chewing. In some cases, a wide jaw can also be caused by frequent jaw clenching which also enlarges the masseters muscles, which can leave an appearance of the face looking wider and more masculine. With the same treatment to prevent jaw clenching, botulinum toxin injections are popular treatment options used to shrink the size of the masseter muscles and improve the appearance of the jaw.
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