Final answer:
The correct term for temporarily straightening curly hair with a heated comb is pressing or hot combing, which is different from chemical processes like perming or relaxing that permanently alter hair's structure.
Step-by-step explanation:
The process of temporarily straightening extremely curly hair by means of a heated comb is called pressing or hot combing. This technique should not be confused with relaxing, which is a chemical process for permanently straightening hair. The pressing method involves the use of a heated comb to straighten the hair temporarily until the next wash. In contrast, perming and relaxing are chemical processes wherein perms create curls by disrupting and reforming the hair's disulfide bonds, and relaxing straightens hair by permanently altering these bonds. Smoothing can refer to a variety of techniques, both temporary and chemical, meant to straighten or reduce frizz in hair.