How can I tell if a filling is going to fall out?

Question by altarilg: How can I tell if a filling is going to fall out?
What are the symptoms?

I had a very very large filling put in almost 3 years ago. At my last dental visit (July '07), the dentist said that it was a "perfect little filling" and that the tooth didn't appear to have any problems.

That filling, though, seems to attract junk. It always gets "dirtier" than the other teeth.

The edge of the filling is very distinct from the edge of the tooth. I'm worried that means it's

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