1, manual plastic surgery: put the pillow on a flat surface, and massage it gently with your hands to try to restore it to its original state. You can try to shape the corners of the pillow into an ideal shape.

2. Hot water soaking: soak the deformed pillow in warm water, and the temperature should not be too high. Then gently massage and shape with both hands. Warm water may make polyurethane materials softer, so it is easier to recover.

3. Air-drying: After the pillow returns to its shape, put it in a well-ventilated place to air-dry. Make sure that the pillow is completely dry before use. Please note that these methods can not completely restore the original shape of polyurethane pillows, but they can help reduce the degree of deformation. If none of these methods can be repaired, you need to consider buying a new pillow.