Which technique uses a comb to create volume at the scalp area?

Teasing or backcombing is the technique that utilizes a comb to create volume at the scalp area. This method involves taking a section of hair and combing it towards the scalp, which leads to the hair fibers becoming entangled and providing lift at the roots. The result is a fuller and more voluminous appearance which is often desirable for certain hairstyles.

In the context of hair styling, teasing is an important skill because it allows hairdressers to manipulate hair texture and create various shapes and volume levels. This technique is frequently used in updos and styles that require added body.

Other techniques listed serve different purposes; for instance, slicing is focused on creating movement and blending in layers without significantly altering the hair's volume, blending is primarily about merging different lengths for a softer look, and point cutting is used to remove bulk and add texture to the ends of hair strands. Therefore, teasing is uniquely aimed at enhancing volume at the scalp, making it the correct answer in this context.