Replacing metal fillings is usually unnecessary but you can have a radiograph taken and they can use different light refractions to see if the filling is indeed leaking. Metal fillings stay in place by a mechanical lock, plastic fillings are glued in place. Both can fail but I think the odds of glue failing is higher.
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"I am a great believer in luck, and I find that the harder I work, the more I have of it." -Thomas Jefferson
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