Cosmetology Practice Test – Pass the Massachusetts State Board Exam (2026 Guide)

The term "chemical straightening" specifically refers to a process that alters the hair’s natural bond structure. This method employs chemical agents to break the disulfide bonds within the hair. Once these bonds are broken, the hair can be reshaped and then re-bonded in a straighter configuration. This results in sleek, smooth hair that is often resistant to humidity and frizz.

The other options involve different hair practices that do not align with the definition of chemical straightening. Using heat to straighten hair is a method known as thermal straightening or flat ironing, which does not change the hair’s internal structure. Coloring techniques pertain to the addition of pigment to the hair, while a type of haircut refers to the styling or cutting of hair rather than altering its chemical structure.