The type of perm used is primarily determined by the hair's texture and what other factor?

The type of perm used is primarily determined by the hair's texture and porosity because these two factors significantly influence how the hair will react to the perming process.

Porosity refers to the hair's ability to absorb moisture and chemicals, which is crucial when it comes to perming. Hair that is more porous can absorb the perm solution more readily, meaning it may require less processing time. Conversely, hair with lower porosity may need a longer application time to ensure that the perm solution penetrates adequately for effective curling.

Together with hair texture, which addresses whether the hair is fine, medium, or coarse, porosity helps stylists make informed decisions about the perm solutions and techniques to use, ensuring the best results for the hair type in question. Other factors, like length, density, and color, are important in terms of overall hair care and styling but do not primarily influence the selection of a perm type as directly as texture and porosity do.