What technique provides a full elimination of curl through thermal methods?

The technique that provides a full elimination of curl through thermal methods is a hard press. This method involves using a flat iron or pressing comb at a high temperature to apply direct heat to the hair, effectively altering its internal structure. The high temperature and consistent pressure work together to break down the bonds in the hair shaft that define its curl pattern.

A hard press ensures that any remaining wave or curl is completely smoothed out, resulting in a straight appearance. This technique is particularly useful for very curly or coarse hair types that require more intense heat application to achieve the desired straightness.

In contrast, other methods, such as a soft press or medium press, may only reduce curl or wave without completely eliminating it, leaving some texture in the hair. Light press offers the least amount of thermal manipulation, making it suitable for a gentle straightening effect but not for full curl elimination. Thus, the hard press stands out as the most effective technique for achieving completely straight hair from a previously curly texture.