Which service requires the use of a chemical relaxer?

The requirement of a chemical relaxer is specifically associated with straightening curly hair. When hair is naturally curly or wavy, a chemical relaxer is applied to alter the hair's structure, resulting in a straighter appearance. This treatment penetrates the hair shaft and breaks down the bonds that give hair its curl pattern, making it possible to reshape the hair into a straighter form.

In contrast, creating curls in straight hair typically involves the use of heat styling tools or curling products rather than a chemical process. Coloring hair can involve various techniques and products, but it does not necessitate the use of a chemical relaxer. Trimming hair ends is strictly a cutting technique and does not involve any chemical treatments. Hence, the use of a chemical relaxer is specifically relevant to the service of straightening curly hair.