Hot perms are a type of hair treatment that uses heat to create curls or waves in the hair. This process involves wrapping sections of hair around heated rods and applying a chemical solution to help set the curls. The heat helps to open the hair cuticles, allowing the chemicals to penetrate and reshape the hair structure. The results of hot perms can last for several months, depending on hair type and care. They are popular for adding volume and texture to straight hair. However, proper maintenance is essential to keep the curls looking their best and to minimize damage to the hair.