When I read the title, I had visions of screws and other things rattling around. Now I realise that you might mean little bits of dust and lint. If so, don't worry. All lenses get some dust inside. Non internal focussing zooms are the worst. I suppose weather sealed lenses should be dirt free.
If the dust is serious, it can lead to loss of contrast, and a clean is required. But that is I think unusual.
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