The short answer: how to flatten rug corners depends entirely on why they curled. Read the shape first. A soft roll on a new rug is storage memory and reverse-rolling fixes it free in 24 to 48 hours. All four corners lifting at once is usually humidity swelling the fibers. One corner alone is mechanical stress from a door or a walking route. A hard crease that springs back means the backing has set or delaminated, so it needs support underneath rather than weight on top. And curling that appeared right after a cleaning is trapped moisture. Match the cause to the fix and you will usually spend nothing.
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