BOTOX is a well-known injectable neurotoxin that works by temporarily paralyzing the muscle. You may be familiar with the use of BOTOX for smoothing out dynamic lines on the forehead and face, but there are several additional applications for this exciting product. For patients with a wide or square face due to enlarged masseter muscles, Masseter BOTOX injection can help to reduce the size of the muscle, resulting in a slimmer, more attractive face shape. When BOTOX is injected into the masseter muscle to relax or “freeze” it, it will begin to atrophy and decrease in size over time. As the muscle shrinks and thins out, patients will achieve a more ideal, slim face.