What do exothermic waves do during the perming process?

Exothermic waves, during the perming process, are characterized by their ability to generate heat from a chemical reaction that occurs within the hair. This heat is produced as a byproduct of the chemical changes that happen when the perm solution is applied. The generated heat helps to facilitate the processing of the hair, allowing the bonds within the hair structure to break and reform in a new shape.

As the heat builds up during the reaction, it enhances the effects of the waving solution, leading to more efficient and effective curling of the hair. This self-heating characteristic distinguishes exothermic waves from other types, making them particularly popular among stylists for their ability to deliver strong, long-lasting curls without the need for additional heat sources.

The other options do not correctly describe exothermic waves. The endothermic reaction refers to absorbing heat, while exothermic reactions release heat. Using an external heat source pertains more to other perming techniques and isn't the defining function of exothermic waves. Furthermore, while processing times can vary depending on the specific perm used, exothermic waves are generally designed to process effectively with less additional time needed due to the heat produced through the chemical reaction.