Which of the following is not a method of relaxing the hair?

The method that is not considered a technique for relaxing hair is wet setting. Wet setting refers to the process of styling hair while it is damp, using rollers or other tools to create curls or waves as the hair dries. This technique is primarily used to enhance texture or provide curl, rather than to relax or straighten the hair.

In contrast, chemical relaxers are specifically formulated products that break down the bonds in curly or textured hair to straighten it. Heat styling involves the use of heated tools, such as flat irons, to temporarily smooth and straighten hair, thereby relaxing its natural waves or curls. Cold waves, commonly associated with perming, involve using chemical solutions to alter the structure of the hair, which can also include processes that relax certain styles. Each of these methods directly impacts the hair's structure with the intent of either altering, relaxing, or straightening the natural curl pattern, unlike wet setting, which does not achieve that goal.