Masseter Botox® is a non-surgical procedure that helps to shrink the masseter muscle, promoting a slimmer, and symmetrical jawline. Specifically for the masseter muscle, Botox is a neuromodulator that works by relaxing this muscle, thus making it shrink in size to adjust asymmetry or to help create a narrower jawline for both men and women. The masseter muscle is one of the largest muscles of the face that is connected to the cheekbone and lower jawbone, which aids mainly with chewing solid foods. This muscle can be easily over-worked and therefore adding a wider and more masculine structure to the face for women, and a more pronounced and disproportionate structure for men. Those who grind their teeth at night or who experience jaw clenching due to anxiety may also have a more pronounced or asymmetrical jawline structure.