Abstract: An adapter is configured to convert a non-self ligating lingual orthodontic bracket into a self-ligating bracket. The adapter is-removably attachable to the non-self ligating lingual orthodontic bracket and includes a self-ligating mechanism. According to a preferred embodiment, the bracket adapter includes a pin, a tube, and a lockwire. The pin is configured to be removably secured to the non-self ligating bracket. The tube is attached to or formed from an occlusal end of the pin. The lockwire is partially mounted within the tube and is capable of rotation between a ligating and a non-ligating position. In its ligating position, the lockwire securely retains an archwire within an archwire slot of the non-self ligating bracket using shear-resistant properties of the lockwire.