Sometimes these are self correcting or can be assisted with vacuuming and a light brushing. In extreme cases the indentation can be covered with a damp towel and carefully steamed with an iron for a few seconds followed by brushing while warm to bring up the pile, there are however limitations and in some cases the indentation is permanent. The weight of the items that have left the indentations will have a large bearing on the results will achieve eg. heavy wardrobes, water beds and such items will generally leave permanent indentations.