Relaxer is a chemical treatment used to straighten curly or coily hair. It works by breaking down the hair's natural bonds, allowing it to be reshaped into a straighter style. However, this process can also damage the hair, making it more prone to breakage, dryness, and split ends.
The severity of the damage depends on several factors, including the strength of the relaxer used, the condition of the hair before the treatment, and how often the relaxer is used. Relaxers can also cause scalp irritation and allergic reactions in some people.