In many cases, TMJ disorder is diagnosed with a physical exam. An experienced TMJ dentist can perform a physical evaluation of the jaw, listening for clicking, crackling or crunching sounds, and applying light pressure to certain areas to feel for any abnormalities. Part of the examination may also involve checking the patient’s range of motion of their jaw, including the ability to open their mouth fully and clench their jaw with pressure.   It is important to note, however, that because the TMJ is so complex, some of the many problems it can experience may require more involved, yet still non-invasive, diagnostic procedures, such as ultrasound or x-ray.