The main dentures are movable dentures which are easy for patients to take and wear freely, and fixed dentures which cannot be taken and worn by themselves. Dentures become black mainly pigmentation and denture chipped porcelain or oxidation two kinds of reasons. 1, pigmentation: refers to the denture surface pigmentation, food, drug residue, cleaning is not in place, or long-term smoking, often drink strong tea and coffee, etc., can lead to pigmentation, resulting in dentures become black; 2, denture chipped porcelain or oxidation: most fixed dentures for porcelain teeth, porcelain teeth chipped porcelain will be exposed when the Black inner crown. If it is a full denture, the denture material may be plastic in nature, plastic dentures may exist oxidation phenomenon, which will make the teeth black. When dentures become black, they need to be cleaned and disinfected in a timely manner. For movable dentures that can be removed, they should be removed promptly for careful cleaning and then placed in cold water for soaking. Normally, you can also choose professional dental disinfectant to disinfect your teeth in order to remove plaque from the surface of the dentures and the gaps between the teeth. Usually, you should reduce the intake of strong tea, coffee and pigmented food to avoid darkening of teeth, and scaling can be done if necessary.