1. Prepare a heart-shaped mold: make a heart-shaped mold, which can be cut out with cardboard or plastic board. Make sure the edge of the mold is smooth to avoid scratching the mask.

2. unfold the mask: take the mask out of the package and unfold it gently to avoid folding or twisting.

3. Place the mold: place the heart-shaped mold on the unfolded mask to ensure that the mask is completely attached to the mold.

4. Folding mask: Carefully fold the mask along the edge of the mold to form a complete heart shape. Make sure that each crease is clear and tidy.