Using a mask having a period of prompts

The present invention relates to a mask having a lifetime indicating function, comprising a mask body having a plurality of filter layers, the filter layer with a presentation device between the mask body is provided, the presenting device having a main body protruding from the outermost mask filter and a layer identification unit enables the identification unit sends identification information of the elastic member, by the recognition unit in order to determine the life of the mask. Masks provided by the invention, the identification unit can not be issued when the identifying information, the mask that is its life, suggesting that it be replaced masks to protect their health.