Temporay color lasts about 6 shampoos. this is great for just a glinpse of no gray.
Semi-permanent lasts about 12 shampoos and fades gradually sometimes never leaving all together.This is great if one is not ready for a drastic change.
Permanent color is just what is says and the only way to change it is to color over it darker never lighter. Be prepared to color again in about 5 weeks as the roots will need to be taken care of.