an orthodontic bracket assembly including brackets mounted upon teeth to ect orthodontic treatment thereof is provided with a self adhesive layer adhered on one side thereof to the surface of the orthodontic bracket which is used to fasten the bracket upon a tooth . a protective foil is arranged to extend on one side of bracket wings formed upon the orthodontic bracket and defining a slot adapted to receive therein a regulating arch when the brackets are mounted upon teeth to be treated . the protective foil defines a gap or spacing within which the base of the orthodontic bracket extends and within which liquid adhesive may be introduced for attaching the bracket to the teeth to be treated .