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How to remove furniture dents from carpet
Remove the furniture.
You can't address dents in the carpet if the furniture is still there. Move the furniture to expose the dent and either rearrange the room to find a new home for the piece, or take it out of the room while you work.
When the carpet is exposed, check the label to determine what kind of material it is. Synthetic fibers can be fixed using the cold ice cube method.