Most cases of a TMJ disorder are diagnosable with a jaw examination. Your doctor will examine your jaw and discuss your symptoms with you.   Your doctor will probably: Listen to and feel your jaw when you open and close your mouth Observe the range of motion in your jaw Press on areas around your jaw to identify sites of pain and discomfort    If your doctor or dentist suspects a TMJ disorder, you may also need: Dental X-rays CT scan to provide detailed imagines of the bones in your jaw MRI to reveal problems with the joint’s disk or surrounding soft tissue