Which of the following techniques is often used to achieve a polished finish in long hair design?

Achieving a polished finish in long hair design often relies on the technique of smoothing. This process involves using various tools and products to create a sleek and refined appearance. Smoothing helps to eliminate frizz, flyaways, and any texture that may detract from the overall elegance of the hairstyle. Utilizing heat tools, such as flat irons, in combination with smoothing serums or creams, can enhance shine and provide a finished look that is both professional and stylish.

In contrast, curling adds volume and texture, backcombing can create height but may result in an unrefined finish, and teasing shares similarities with backcombing. While these techniques are valuable for creating various styles, they do not contribute to achieving a polished and sophisticated finish in the same way that smoothing does. Thus, smoothing stands out as the most effective technique for this purpose.