Which of the following is not a type of relaxer?

In the context of hair care, relaxers are products specifically formulated to straighten curly or wavy hair, making it more manageable. Lanthionine, sodium hydroxide, and amino acid relaxers are all recognized types of relaxers, each using different active ingredients to alter the hair’s structure.

Lanthionine relaxers work by reducing the disulfide bonds in the hair, resulting in a straighter texture. Sodium hydroxide relaxers, known for their strong chemical properties, break down the protein structure in the hair, allowing for significant straightening. Amino acid relaxers, which are milder, utilize amino acids to achieve a smoother look while being less damaging to the hair.

On the other hand, wax is not a relaxer. Rather, it is typically used for styling purposes, aiding in defining, shaping, and holding hair in place. It does not chemically alter the hair structure to achieve straightness and therefore does not fit the definition of a relaxer. This distinction clarifies why wax is the correct answer as the option that does not belong to the category of hair relaxers.