Which method removes 100% of the curl from hair?

The method that removes 100% of the curl from hair is a hard press. In hairstyling, a hard press involves applying a significant amount of heat using a styling implement, such as a flat iron, along with tension on the hair strands. This technique effectively straightens the hair more thoroughly than other pressing methods.

In comparison to other options, a soft press only slightly straightens the hair and maintains some curl; it is often used for adding shine and smoothing rather than completely eliminating curl. A medium press provides a more substantial flattening effect than a soft press but still does not achieve complete straightness. A rollerset is a styling technique that creates curls or waves and is not used for straightening hair at all. Thus, a hard press is specifically designed to achieve the maximum straightening effect on the hair.