Abstract: The present disclosure provides a self-ligating bracket, a double-wing spacing adjustable bracket and a dental appliance. The self-ligating bracket includes: a bracket base plate; a first end of a first elastic support is connected to the bracket base plate; a bracket body is a hollow structure, a second end of the first elastic support is connected to a distal end of the bracket body, and the distal end of the bracket body is provided with a gap and the distal end of the bracket body is expanded radially by the second end of the first elastic support; and a position-limited member is movable in an axial direction of the bracket body, and the position-limited member is sleeved on an outside of the bracket body for overcoming expansive force provided by the elastic supports and making the bracket body contract along a radial direction.

Abstract: The present invention relates to a novel anchor-preparing buccal tube. The buccal tube finds use in orthodontic treatment. The buccal tube described herein has at least one passage for receiving a main arch wire. The buccal tube can also include multi-passages so that clinicians have the option to insert the main arch wire into one of the passages to tip back the molar(s) or prevent the molar(s) from tipping forward. As such, anchorage is enhanced during orthodontic treatment. The novel buccal tube provides for a tip-back angle with a light-force and aesthetically pleasing nickel-titanium wire used in modern orthodontics to cause a tip back movement of the molar so that an anchorage preparation is possible without the use of stainless steel wire.