Which technique is essential for adding volume at the roots during styling?

Backcombing, also known as teasing, is the technique that is essential for adding volume at the roots during styling. This method involves using a fine-toothed comb to push the hair backward at the roots, creating a cushion of lifted hair that results in increased body and volume. This technique is particularly effective for achieving a fuller and more dramatic look, especially in hairstyles that require height and bounce.

Other styling techniques, such as flat ironing, are primarily used for straightening hair and do not contribute to volume. Smoothing focuses on reducing frizz and creating a sleek appearance, while pinning is often used to secure styles rather than to create volume. Backcombing is thus the key method for elevating the roots and creating that desired voluminous effect.