Curl cream, primarily designed for wavy or curly hair, can indeed be used on straight hair. When applied to straight hair, it can provide added texture and a bit of volume. If someone with straight hair wants to try curl cream, they should dampen their hair first, then evenly distribute a small amount of the product. After applying, they can scrunch or twist their hair and let it air dry. While they shouldn’t expect defined curls, they might achieve a more tousled, wavy look.