Gum stains left after orthodontic treatment can generally be removed by ultrasonic cleaning, sandblasting and polishing in regular dental institutions. The yellow gum stains left after orthodontic treatment are generally the residue of resin adhesive used for bonding brackets during orthodontic treatment, which has good bonding performance and strong adhesive strength, and generally will not fall off on its own. Long-term presence will make the surface of the teeth become rough, easy to accumulate more food debris as well as pigment, and over time easy to form stones. In this case, you need to go to a dental institution to remove it through ultrasonic scaler and polishing. Yellow stains left after orthodontic treatment are essentially adhesive residue that will not be removed by brushing and will not come off on its own. Therefore, they should be removed at the earliest possible time by visiting your local dental facility for cleaning and polishing.