Acid perms are a type of hair perm that uses a gentler formula compared to traditional alkaline perms. They contain a lower pH level, making them less damaging to the hair. Acid perms are ideal for individuals with fine or damaged hair, as they create soft, natural-looking curls or waves. The process involves applying a perm solution to the hair, which breaks down the hair's protein structure. After the desired curl is achieved, a neutralizer is used to set the curls in place. Acid perms typically take longer to process but result in more defined and long-lasting curls.