It's suddenly throbbing for no reason.

Even when I'm not doing anything, the inside of my molars throbs with a sharp, stabbing pain.

Then suddenly, for about a day, it is peaceful and I don't feel any pain.

But if I let my guard down, the next day it pricks again, and sometimes it throbs.

I had a gold filling done; could it be decayed?

I'm scared my teeth might be decayed.