It could be a sinus ache. My sinus headaches affect my entire face, jaw included, and ears. I've also self diagnosed myself with TMJ. My jaw 'pops' and 'clicks' when I open my mouth too wide and eat. The aches from my jaw because it's out of whack are ridiculously painful and can feel like a toothache, and neck ache. I sometimes use ice to calm it down, or even a hot washcloth to reduce any swelling or inflammation. I might go to the clinic just to get ideas on how to manage the pain because it's so frequent. I was concerned that it was a tooth issue until I went to the dentist and they did x-rays. Teeth are fine!