The main indication that it is time to contact a TMJ dentist is having sharp or persistent pain in the jaw muscles. Some people also hear a distinctive click when opening or closing the mouth. Waking up with a stiff or stuck jaw is another sign that patients may have TMD. According to WebMD.com, people with a TMJ disorder may also notice ringing in the ears, toothaches, headaches, dizziness, neck aches, and hearing issues.