Name a common aftercare instruction for clients post-perm.

Avoiding washing the hair for at least 48 hours after a perm is a crucial aftercare instruction. This period is important because the perm solution needs time to fully set and stabilize the new curls or waves. Washing the hair too soon can disrupt the chemical bonds that have just been formed, potentially leading to a loss of curl and overall shape.

In the context of hair care following a perm, allowing this time ensures that the treatment can achieve its maximum effectiveness. In addition, it helps to maintain the moisture balance and the integrity of the hair, which is particularly important after undergoing a chemical process. Other options, such as washing the hair right away, using excessive heat styling, or brushing the hair vigorously, are not recommended as they can damage the newly permed texture or lead to undesired results.