What is the purpose of back combing in hairstyling?

Back combing, also known as teasing, is a hairstyling technique used primarily to create volume and lift at the roots of the hair. This is achieved by taking small sections of hair and combing them back towards the scalp, which results in a larger, fuller appearance in areas where volume is desired. The structure of the hair is temporarily altered, allowing styles to maintain a buoyant look that can be particularly beneficial for updos or other styles requiring a boost of height.

In terms of the context of the other choices, while straightening hair and removing frizz can enhance the overall appearance of a style, they do not pertain to the specific action and effect of back combing. Adding shine and smoothness typically involves the use of finishing products or techniques that focus on the outer layer of the hair, rather than the volumizing action inherent in back combing. Similarly, achieving a sleek finish usually relates to flat-ironing or blow-drying with tension to smooth the cuticle of the hair, which contrasts with the rougher texture created by back combing. Thus, the primary objective of back combing remains creating volume at the scalp.