Clove leaf essential oil is extracted from Eugenia caryophyllene, also known as Syzygium aromaticum, Eugenia aromatic, E. Carophyllus of the Myrtaceae family. It is extracted by steam distillation of the leaves. It has a warm, strong, spicy smell and the oil is colorless to pale yellow with a medium to watery viscosity. The whole tree is highly aromatic. A native of Madagascar and Indonesia, Eugenia caryophyllene is an evergreen tree that grows to about 10 meters tall and has bright green leaves. It was often used by the Greeks, Roman and the Chinese, to ease a toothache and as a breath sweetener. The main chemical components of clove oil are eugenol, eugenol acetate, iso-eugenol, and caryophyllene.