Final answer:
The correct term for the process of temporarily straightening extremely curly hair with a heated iron or comb is straightening. This differs from relaxing, which involves chemical treatments, and perms, which can be permanent or temporary and are used to create curls or waves.
Step-by-step explanation:
The process of temporarily straightening extremely curly hair using a heated iron or comb is referred to as straightening. This process can also be called relaxing when it involves chemical treatments, but in the context of using heated tools without permanent chemical alteration, the correct term is straightening. Unlike perms, which can be either temporary or permanent and involve either thermal or chemical means to create curls or waves, straightening temporarily removes curls to achieve a smoother texture.