What is a perm? The “permanent wave” or “perm” permanently alters hair structure to create curls, waves, or straightness. Thioglycolic acid is applied to hair strands coiled around rods. The chemicals breakdown the hair shaft connections when the hair is placed on the rods, allowing the hairdresser to reshape it. After shaping the hair, a … Continue reading Perm Power: Your Ultimate Guide to Everything About Perm Hair