If the perm does not last as long as expected, which issue is indicated?

• A. Incomplete neutralization
• B. Overneutralization
• C. Too much oil
• D. Too little heat

Answer: (A)

The main idea here is how the curl is locked in place after the chemical reduction step. In a perm, a reducing agent breaks the disulfide bonds, you shape the hair, and then a neutralizer reforms those bonds in the new shape. If neutralization isn’t complete, the bonds aren’t fully rebuilt in the new configuration, so the hair gradually reverts toward its original structure. That means the curl doesn’t stay as long as expected and may relax after washing or over time.

Think of the neutralizer as the step that “sets” the new shape. When it’s not applied long enough, not at the right strength, or not rinsed and timed properly, the setting isn’t strong enough to hold the curl, even if the hair initially looks curled.

The other options point to factors that influence processing or hair condition rather than the binding step itself: too much oil can hinder chemical penetration, too little heat changes processing speed in some systems, and overneutralization can damage hair and alter outcomes, but they don’t explain why a curl would be noticeably shorter-lived in the same way incomplete neutralization does.