Method of monitoring oral health

A method of monitoring oral health comprising:

• deriving a health profile of a user from information obtained from a liquid or vapor sample taken from the user;
• displaying a representation of the health profile on a display, wherein the representation of the health profile comprises an indication of one or more health aspects of the user, the health aspects comprising one or more undesirable health characteristics;
• displaying the one or more undesirable health characteristics in a list;
• and
• wherein in response to the user selecting a first one of the undesirable health characteristics from the list, an indication of historical values associated with the first one of the undesirable health characteristics and a graphical depiction of an oral cavity divided into a plurality of regions are displayed on the display, the graphical depiction of the oral cavity on the display indicating which regions of the individual's oral cavity are affected by the first one of the undesirable health characteristics.