A permanent wave, also known as a perm, is a chemical hair treatment that is used to add curl or wave to straight hair. The process involves wrapping the hair around rods and applying a solution of chemicals, typically ammonium thioglycolate, to break down the hair's protein bonds. The hair is then neutralized with another chemical solution, and the new shape is set. The end result is hair that has a new, permanent wave or curl pattern. The treatment can be done by professional hairstylist in salons and can last 3-6 months.

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