Ozone is a colorless with a particular smell at room temperature consisting of three oxygen atoms.Ozone exists in nature in very small quantities.High voltage arcs occur after thunders in rainy weathers increase ozone density in the air.We feel it as rain,and soil smell.Medical ozone is made of %5 ozone and %95 oxygen.This mixture is made by a special generator out of pure medical oxygen.Medical ozone is known to have local disinfecting properties which kills bacteria and fungus, and stops virus reproduction.After 1950s thanks to medical devices developments,desired density of ozone became available, and widely used in medicine.