The onion is round or oblong tunicated bulb. It is a biennial garden plant having a scape which is 2 to 4 feet high smooth, straight, stout and swollen at the base. The onion has many medicinal properties which are described in literature from time to time. This review describes the application and use of onion in dentistry and its other medicinal properties.

Keywords: Onion; Medicinal Plants; Allium.