An assembly for use in straightening teeth in. lingual orthodontics includes a plurality of brackets and a plurality of removable arched wires providing progressively increasing tension to the bracket assembly in the operative configuration when the brackets are fixed to the lingual surfaces of the teeth and the arched wires are hooked to slots in the respective heads of the bracket assembly, wherein each bracket has monolithic structure and is defined by a head portion, a base portion and a neck. The head portion has a slot for attachment of the arched wire thereto and is selected from a head suitable for an incisor tooth, a canine tooth, a pre-molar tooth and a molar tooth. The base portion defines a contoured surface that matches the contour of the tooth for which the bracket and head portion is selected. The neck bridges the head portion to the base portion.
