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For how long is pizza good after you put it in the fridge?

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I haven't had lunch yet, and I have some old pizza from 4 days ago. Is it still good? How do I know when it's gone bad? The pizza has some salami, mushrooms, garlic, and artichokes on it...it smells good, but I thought I'd double check. How would i know my old pizza has gone bad?

Thanks!