Permanent wave A permanent wave otherwise known as a perm, are waves in the hair made by applying heat and chemicals. The perm involves the use of chemical products to break and reform the bonds of the hair.
Types of permanent wave There are two main kinds of permanent waves or perms. The first are spiral perms. A spiral perm uses permanent hair products with small curling rods, which produces tighter curls. Body waves however, make use of he same technique only with larger curlers that add a wavy effect instead of twisted ringlets.