The curl from a permanent wave (or perm) can last as long as year, if it is done effectively. During this time, the perm may grow out and change a bit, but the curls will remain intact. Some perms may last only 3-6 month... More »

Users of semi-permanent or temporary hair color can expect their color to last for about 6 weeks. Color fades with shampooing and exposure to air. More »

Semi-permanent eyebrow tattoos last between one to three years. The process of applying the tattoo lasts under an hour and costs approximately $1,000, as of 2015. More »

A standard perm uses ammonium thioglycolate to break the natural disulfide bonds that create the natural texture of hair while it's in curlers. Then, a neutralizing agent stops the bond-breaking process and allows the ha... More »

Cold wave perms contain the chemical ammonium thioglycolate. True acid wave and acid-balanced wave perms contain glyceryl monothioglycolate. Exothermic wave perms contain ammonium thioglycolate as well as an oxidizer lik... More »

A perm should grow out in about a year. At this point, the relaxed hair can be cut off, leaving behind a short, natural hairstyle. More »

On average, a perm is designed to last six months or less. The exact amount of time varies depending on the person. More »