The present invention relates to an orthodontic treatment bracket, which includes a bracket base and a groove with a Tip-edge shape and also has a detachable groove extender. The present invention can switch two different contact modes between the archwire and the bracket groove through flexibly controlling the length of groove with the extender, for purpose of satisfying the different requirements for friction in different clinical treatment stages. The present invention is also related to a double-groove bracket with a groove extender, including a bracket base and a mesial groove and a distal auxiliary groove which are parallel and located at the upper and lower sides of the bracket base. The distance between the base of the mesial groove and the bracket base is greater than the distance between the base of the distal auxiliary groove and the bracket base. The vertical distance between the lateral center line of the mesial groove and that of the distal auxiliary groove is 0.086-0.196 inches, effectively controling the movement of teeth in three directions, improving the effect of the orientation adjustment and shortening the duration of orientation adjustment.
