Self-ligating orthodontic brackets, each of which is formed of materials exhibiting shape memory and includes a base from which extend at least one tie wing. The tie wing includes a pair or tie wing posts which are normally spaced to retain an archwire within the guide slot. At least one of each pair of opposing tie wings is flexible and/or yieldable relative to the other to permit insertion and/or removal of the archwire relative to the guide slot. Portions of the brackets may be coated to reduce friction between the archwire slot and the archwire and to promote aesthetics and overall bracket appearance.