Peppermint Oil (aromatherapy)

Natural Peppermint Oil is a pale yellow or pale olive colored liquid of fresh, strong, somewhat grassy-minty odor with a deep balsamic-sweet undertone and a sweet, clean dryout note. The grassy topnote may disappear or fade after proper ageing of the oil (polymerization of the lower aldehydes, etc.). Even the odor gives an impression of coolness, often due to the psychological effect of associating the known flavor with the impression of the odor. Peppermint odor and flavor are well known by practically everybody who brushes his teeth, eats candy, chews gum, uses mouth sprays or gargles, etc. The flavor of the oil appears strong and cooling, but the cooling effect masks some of the delicate, sweet-balsamic undertones of the oil. This
Arctander, Steffen . Perfume and Flavor Materials of Natural Origin (pp. 596-597). 

mentha piperita