Creates space to improve tooth alignment. Helps to improve the bite (the way your teeth fit together). Can increase the stability of the teeth, so they will retain their position long term. Can reduce “black triangles”. This is created by the absence of gum tissue (gingival papilla) between teeth and gives the appearance of a dark space or hole. IPR in certain cases may alleviate the need for permanent tooth extractions. Gear ratio: 4:1. Stroke: 1.4mm. Rotation speed: 10000r/min. Kit contains : - 1 X 4:1 IPR contra angle. - 10 X Metal strips（15μm/25μm/40μm/60μm/90μm each 2pcs). - 1 X Gauge. - 1 X Holder. - 1 X Pushrod. **For further product information , please contact Chat Support**