An orthodontic appliance comprising: a telescopic assembly comprising at least an end tube with a hollow interior and a telescopic member telescopically disposed within the end tube; a distal connector secured to the end tube at a generally distal end of the telescopic assembly; a mesial connector secured to a generally mesial end of the telescopic assembly; a first archwire connector removably coupled to the distal connector and a second archwire connector removably coupled to the mesial connector, the first and second archwire connectors configured to removably at least partially surround at least one archwire to secure the orthodontic appliance to the archwire; and a spring located coaxially within the end tube, the spring configured to impart a biasing force between the end tube and the telescopic member, wherein the first and second archwire connectors each comprise a threaded through-hole, characterized in that the first archwire connector and the second archwire connector each include a wire slot defined at least in part by a lip, the distal connector comprises a first screw movably secured to the distal connector and the first archwire connector is removably coupled to the distal connector by the first screw threadingly engaging the threaded through-hole in the first archwire connector, the mesial connector comprises a second screw movably secured to the mesial connector and the second archwire connector is removably coupled to the mesial connector by the second screw threadingly engaging the threaded through-hole in the second archwire connector, each wire slot and each lip are configured such as to at least partially surround the archwire at a location defined by the wire slot and the respective screw, each screw, when extending through the through-hole, obstructs the respective wire slot in a way such as to movably restrain the archwire within the respective wire slot or to fixedly secure the respective archwire connector to the archwire. a telescopic assembly comprising at least an end tube with a hollow interior and a telescopic member telescopically disposed within the end tube; a distal connector secured to the end tube at a generally distal end of the telescopic assembly; a mesial connector secured to a generally mesial end of the telescopic assembly; a first archwire connector removably coupled to the distal connector and a second archwire connector removably coupled to the mesial connector, the first and second archwire connectors configured to removably at least partially surround at least one archwire to secure the orthodontic appliance to the archwire; and a spring located coaxially within the end tube, the spring configured to impart a biasing force between the end tube and the telescopic member, wherein the first and second archwire connectors each comprise a threaded through-hole, characterized in that the first archwire connector and the second archwire connector each include a wire slot defined at least in part by a lip, the distal connector comprises a first screw movably secured to the distal connector and the first archwire connector is removably coupled to the distal connector by the first screw threadingly engaging the threaded through-hole in the first archwire connector, the mesial connector comprises a second screw movably secured to the mesial connector and the second archwire connector is removably coupled to the mesial connector by the second screw threadingly engaging the threaded through-hole in the second archwire connector, each wire slot and each lip are configured such as to at least partially surround the archwire at a location defined by the wire slot and the respective screw, each screw, when extending through the through-hole, obstructs the respective wire slot in a way such as to movably restrain the archwire within the respective wire slot or to fixedly secure the respective archwire connector to the archwire.