Which styling technique is used to achieve a smooth, straighter hairstyle on curly hair?

Off-base curling is a technique used primarily to create volume and curls, rather than to straighten hair. This method involves placing the curling roller off the base of the hair strand, resulting in loose and airy curls rather than a smooth and straight finish. Therefore, it is not suitable for achieving a straight hairstyle.

On-base rolling is another curling method that focuses on creating tight curls by placing the roller directly on the base of the hair section. This technique is intended to enhance curl definition and volume, which is contrary to the goal of achieving a smooth, straight hairstyle on curly hair.

Natural drying refers to allowing hair to dry without the use of heat tools. While this can reduce frizz and enhance natural texture, it does not specifically straighten curly hair. Without any additional techniques, natural drying typically maintains the hair's existing curl pattern rather than transforming it into a straight style.