Question

Hair wound smoothly around the permanent wave rod without stretching allows hair to ________ during processing.

1) Stretch
2) Break
3) Curl
4) d. Straighten

Answer 1

Hair wound properly around a permanent wave rod without stretching allows it to curl during processing due to the disruption and reformation of disulfide bonds in the hair strands.

Step-by-step explanation:

When hair is wound smoothly around the permanent wave rod without stretching, it allows hair to curl during processing. This is because the chemicals used in a perm disrupt the disulfide bonds in the hair strands, and when the hair is wound around a rod and these bonds are reformed, it takes on the shape of the rod, resulting in curls. A proper technique is crucial to avoid hair damage, such as breaking or overstretching.