Down the side of the audiogram, there is a measure of loudness. At the top of the graph are the very. quiet sounds, going down to moderate, and then very loud sounds. The points (red circles and blue. crosses) marked on the graph represent the quietest sound which can be just heard.
Steps. 1  1. Wait at least 3 days to wash newly permed hair, or your perm would not last as long. 2  2. Use hair care products that are safe for permed hair 3  . 3. Wash your hair gently (don't scrub too hard or your hair will tangle up)(your hair is very porous and fragile). 4  4. Gently rinse your hair.
1 Although new hair growth will be a factor after a couple of months, perms can last for up to six months with gentle care and treatment.  To make a perm last longer, avoid heat styling as much as possible. Use a hair-dryer diffuser to help retain the curl of the perm and soften the damage of heat styling.