Masseter Botox Muscle Slimming Masseter Botox is a non-surgical treatment where Botox is injected into the masseter muscle, situated on the side of the face, aiding in chewing. This procedure, also known as jaw Botox, utilizes botulinum toxin to temporarily halt nerve signals in the muscle, leading to reduced movement. This treatment is sought for various reasons including achieving a slimmer jawline, reducing teeth grinding or jaw tension, and addressing TMJ disorders. The effects are temporary, necessitating repeat treatments to maintain the desired outcome.