What type of product is specifically used to alter the curl pattern of hair?

The type of product specifically used to alter the curl pattern of hair is a perm solution. This chemical product is designed to break down the protein structure of the hair, allowing it to be reshaped into curls or waves. When applied, the perm solution disrupts the bonds in the hair, which can then be reformed using curlers or rods. After the desired curl is achieved, a neutralizer is applied to lock in the new shape.

Hair serum, conditioner, and shampoo serve different purposes. While hair serum can help in managing frizz and adding shine, it does not alter curl patterns. Conditioner is primarily used to moisturize and improve hair texture, and it has no effect on altering the natural structure of the hair. Shampoo is formulated to cleanse the hair of dirt and oils but also does not change the curl pattern. Therefore, perm solution is distinct in its purpose of changing the hair's curl structure permanently.