A bone density x-ray in May showed I have osteopenia (GP said all normal so do check your own). I have had pain in my jaw for over three months and just been expecting it to go away but as it worsened I went to the dentist. Dentist found very swollen gum and a bad infection under the tooth which she thinks is probably in the ligaments and a result of the osteopenia (drawing calcium away from teeth for my bones).
So, if you have jaw pain, as I notice someone recently posted they did, trot along to your dentist nice and quick.