TMJ is a disorder that causes pain in your neck and jaw areas, or/and a clicking noise when you open or close your mouth. It can also limit the range of motion in your jaw. There are several things you can do to help TMJ, including a temporary night guard, avoiding sharp movements with your jaw, icing your jaw to prevent inflammation, modifying your diet to include softer foods that require less chewing, and practicing relaxations and light stretching techniques to reduce tension in your jaw.