What is the main difference between exothermic perm and other perms?

• A. Exothermic perms require external heat
• B. Exothermic perms eliminate the need for chemical solutions
• C. Exothermic perms use no processing time
• D. Exothermic perms generate heat chemically within the solution, reducing the need for external heat

Answer: (D)

Exothermic perms generate heat through the chemical reaction inside the solution itself. That internal heat speeds up the waving process, so you rely less on external heat sources like caps, dryers, or heat lamps. The processing time still matters, but the temperature is partly maintained by the reaction, not by outside heating. The other options describe scenarios that don’t fit how exothermic perms work: they don’t require external heat, they don’t eliminate chemical solutions, and processing time isn’t removed.