Famous How Long After Perm Can You Wash Hair Ideas. If you’re not sure what type of perm you have, ask your stylist. Web as a general rule, it is best to wait at least 72 hours before washing your hair after a perm.

Web avoid washing your hair for 48 hours after getting a perm as the curls continue to set. A perm always has to grow out—but, thankfully, they typically grow out as. Otherwise, the chemicals in your hair will get degraded,.