Toothache. Clove oil and eugenol, one of the chemicals it contains, have long been used topically for toothache, but the U.S. Food and Drug Administration (FDA) has reclassified eugenol, downgrading its effectiveness rating. The FDA now believes there isn't enough evidence to rate eugenol as effective for toothache pain.
The aromatic rhizome of Zingiber officinale is the source of ginger, a spice used for centuries to add flavour in cooking. In Asia the fresh stem is an essential ingredient of many dishes, whereas the dried, powdered spice is more popular in European cooking. Gingerbread, one of the most popular uses for ginger in Britain, dates to Anglo-Saxon times when preserved ginger (produced by boiling the rhizome in sugar syrup) was used, often medicinally.
A semi-drying oil obtained from the seed is used in soap making. An essential oil from the peel is used as a food flavouring and also in perfumery and medicines. A higher quality essential oil is obtained from the flowers. The peel contains 0.4% essential oil. An essential oil obtained from the leaves and young twigs is called 'petitgrain oil'. Yields are around 0.4%.