I had an old silver filling in one of my "smile" teeth. It was the fourth one back, just enough to show "dark" in that spot when I smiled. I haven't felt great about my smile since I got that filling over 20 years ago.
I had it replaced with a white filling. OMG, it looks so good. Why the hell didn't I have it done before now? It only cost me $23 (with insurance). WTF was I waiting for?
I have 5 more old silver fillings in my back teeth that are getting replaced too.
I love my new dentist. No one had ever suggested doing this before now, and I never thought to ask.