What effect does a round brush have when blow-drying hair?

A round brush is specifically designed to create various styling effects while blow-drying hair. When used correctly, it can add volume and curls because the brush allows the stylist to wrap sections of hair around the barrel. As heat from the blow dryer is applied, the hair is molded into the shape of the brush, encouraging lift at the roots and a rounded shape throughout the lengths of the hair.

The technique involved with a round brush enriches the blow-drying process by not only adding body and fullness but also enabling the creation of soft waves or bouncy curls. This functionality is ideal for finished hairstyles that require movement and texture.

While other options address different styling effects, they do not accurately depict the primary purpose and outcome of using a round brush. For instance, straightening hair typically requires a flat or paddle brush, creating a flat look doesn’t utilize the round brush's unique shaping ability, and the notion that it would damage hair is more contingent on the technique and heat settings rather than the brush itself. Thus, the round brush is a key tool for achieving that desired volume and curl during the blow-drying process.