Masseter muscle mass are our muscle mass of mastication, or chewing. If you’re feeling the place your jawline hinges on all sides of your cranium, there is a proper attitude. “When you chew down, you’ll be able to see and really feel the prominence or bulge there — that is the muscle,” Dr. Doft explains. In case you have TMJ, you could have different signs that relate on your masseter muscle mass. Robert Merrill, DDS, scientific professor and residency director for oral facial ache on the UCLA College of Dentistry tells R29: “This would come with some jaw muscle tenderness, clicking, or different noises all through jaw motion and joint tenderness,” he says.