A bad breath detection system comprising: a bad breath detection device and a indicating agent on the bad breath detection device wherein when a user places the bad breath detection device in their mouth the indicating agent provides a visual cue depending on a concentration of malodorous compounds in a saliva sample of the user to indicate to the user a level of breath freshness. The bad breath detection device may be embodied in various forms including a tube where the user blows into the tube for detection, a strip where an end of the strip is placed in the users mouth or a disc where the user places the disc into their mouth for detection.
