How are perms typically classified?

Perms are typically classified by the method of application because the technique used to create the curls or waves determines the final result, the type of curl produced, and the overall impact on the hair. Different methods include traditional wrap techniques, spiral perms, and pin curl perms, among others. Each of these methods utilizes varied wrapping techniques and products that influence the size, shape, and permanence of the curls.

The classification based on application method is essential for stylists to choose the appropriate technique based on the client's hair type, desired outcomes, and maintenance considerations. Other options, such as length of hair or age of the client, do not fundamentally change the nature of the perm itself, while the dye used relates to hair color rather than the perming process.