Which service is commonly used to enhance natural curl patterns in hair?

A perm, or permanent wave, is a chemical treatment designed specifically to alter the structure of hair to create or enhance curls and waves. The process involves using a chemical solution to break down the hair's natural bonds, followed by wrapping the hair around rods or curlers. This allows the hair to be set into a new shape, giving it a more defined curl pattern that lasts for several weeks or even months, depending on care and hair type.

In contrast, a curling iron treatment uses heat to temporarily style the hair, while hair straightening works to eliminate curls and create a sleek, smooth look. Deep conditioning, on the other hand, is beneficial for maintaining healthy hair but does not alter the curl pattern itself. Hence, the perm stands out as the primary choice for enhancing natural curl patterns in hair.