Final answer:
Before applying the Neutralizer in a perm process, it's crucial to completely rinse out the perm solution to ensure the disulfide bonds reform correctly without interference, resulting in the desired hair shape.
Step-by-step explanation:
It is essential to completely rinse the perm solution from the hair before applying the Neutralizer. This step is critical as the neutralizer, typically a dilute solution of hydrogen peroxide, is used to re-form the disulfide bonds in the hair in their new positions after the hair has been put on rollers or curlers. The chemical process of a perm includes breaking and then reforming these disulfide bonds to give hair its new shape. Performing a thorough rinse ensures that the residual perm solution does not interfere with the action of the neutralizer, which could affect the outcome and health of the hair.