What aftercare advice could be given to a client after a perm service?

After a perm service, it's essential to advise clients to wait at least 48 hours before washing their hair to allow the curls to set properly. They should use sulfate-free shampoos and conditioners to maintain moisture and reduce frizz. Regular deep conditioning treatments can help keep the hair healthy and hydrated. Additionally, clients should avoid heat styling and minimize exposure to harsh chemicals to prolong the life of their perm.