What is an alkali-based chemical relaxer primarily used for?

An alkali-based chemical relaxer is primarily used to permanently straighten curly or wavy hair. This type of relaxer works by breaking the disulfide bonds in the hair's keratin structure, allowing the hair to be reshaped into a straighter form. As a result, it effectively alters the natural wave or curl pattern, providing long-lasting straightening effects.

This option reflects the chemical's intended purpose and functionality within the realm of hair treatment, making it especially useful for individuals seeking a more manageable and sleek hair texture. The other choices do not accurately represent the primary use of alkali-based relaxers; temporary straightening, curl enhancement, and adding wave patterns refer to different techniques or products that serve contrasting purposes.