On May 4, 2010, my dentist removed the old silver filling in my tooth and replaced it with the white filling. The tooth in question is the very last back tooth on the upper left. Ever since then it hurts to chew on that side. I have gone back to the dentist 3 (maybe 4) times since then and they cannot figure out what the problem may be. It is now June 29th, I'm still having problems, and the pain is waking me up at night now. Any suggestions? The entire left side of my mouth aches.