Which type of chemical service uses sodium hydroxide as its main ingredient?

Sodium hydroxide is primarily associated with chemical relaxing services. This substance serves as a strong alkaline agent that works effectively to break the disulfide bonds in the hair structure, which are responsible for its natural curl pattern. When sodium hydroxide is applied as a relaxer, it allows the hair to be straightened and restructured, thereby making it more manageable and easier to style.

Chemical relaxing specifically targets the structural bonds of curly or wavy hair, facilitating a smoother, straighter appearance. This method is particularly beneficial for clients with coarse, textured hair who are seeking to reduce curl and frizz. The presence of sodium hydroxide in this process is key to its ability to penetrate the hair cuticle and alter the hair’s natural state.

In contrast, other services listed in the options have different chemical compositions and intended uses. For example, permanent waving uses amine compounds rather than sodium hydroxide to create waves or curls, while coloring services involve dyes and developers that do not contain sodium hydroxide. The soft curl reformation service is designed to change the texture of hair but typically utilizes a different formula, often including milder ingredients compared to those found in traditional chemical relaxers.