A strong jawline is often associated with attractiveness, youthfulness, and confidence, and it has become a popular feature that both men and women aspire to enhance. The muscles, located on the sides of your jaw, can become enlarged due to frequent use, such as from chewing or teeth grinding (bruxism). By injecting Botox into the masseter muscles, the muscles relax and gradually reduce in size. This softens the appearance of the jawline, creating a more tapered, V-shaped, or oval facial contour.