Dark stains on dentures can be improved by daily cleaning and care, sandblasting or polishing. 1. Daily cleaning: black stains on dentures may be caused by drinking strong tea and coffee for a long time, etc. Patients can remove the dentures and clean them by toothpaste, tooth powder, ultrasonic washing, etc. 2. Nursing care: patients should keep the habit of cleaning dentures after meals in their daily life, and avoid foods with high pigmentation such as black beans, black sesame seeds, black rice, etc. Patients can eat some light and chewable vegetables such as cabbage, broccoli, mustard greens, etc., and at the same time, patients should avoid smoking, drinking and so on. 3. Sandblasting or polishing: patients can also go to the hospital, under the guidance of the doctor with professional tools for sandblasting or polishing treatment. It is recommended that patients should maintain good cleaning habits after meals and pay attention to the care of dentures on a daily basis.