I have 2 teeth with 3-4 year old metal fillings in them. They are both on the bottom and on the oppositse sides. My left tooth has recently become painful and hurts when I eat or drink something cold or hot. Due to this, I moved to chewing on my right side. Now, I am having a little pain on the side too, in the other metal filled tooth. What is the problem? I cannot tell if it's chipped or not.