When there is darkening of the teeth and gum area, it is important to clarify what the cause is. If it is due to localized stains or tartar in the periodontal pockets, at this time you can clean up the stains and tartar by means of a full mouth cleaning, and the darkening will gradually improve. If the tooth itself has been caries, and caused inflammation of the gums, this time must be the first time to carry out filling treatment, will be clean caries removal, after the upper part of the high-strength resin material filling, the teeth will be able to exercise normal function, the gums of the inflammation will be completely eliminated. The presence of metallic porcelain crowns in the mouth itself can lead to staining and darkening of the gums if the metal edges of the crowns irritate the gums for a long time. This time proves that there is more active metal in the metal-based material, it will have precipitation phenomenon, in fact, is not good for the health of the gums, it is recommended that the patient replaced with all-ceramic crowns, so that it will not cause irritation to the gums.