What technique helps achieve a more defined curl using a roller?

Shaping the hair before roller placement is critical for achieving a more defined curl. This technique involves preparing the hair by smoothing and sectioning it, which allows the roller to grip the hair more effectively and enables the curl to set optimally as it cools. When the hair is shaped properly, it ensures that the strands are aligned and the roller can create a uniform curl pattern.

While using tightly spaced comb teeth can help in detangling the hair, it doesn't directly contribute to the definition of a curl as much as the initial shaping does. Applying styling product after curling might offer hold or additional texture, but it does not set the hair or ensure the definition of the curl during the initial rolling process. Using larger rollers is primarily aimed at creating volume rather than defining curls, as larger rollers tend to produce looser waves rather than tightly defined curls. Thus, the act of shaping the hair before roller placement is foundational for successfully achieving the defined curls desired.