Gum disease affects about 75 percent of adults over age 30, according to the Ontario Dental Hygienists' Association. Turmeric powder contains the key constituent curcumin, a substance known for its antioxidant and anti-inflammatory qualities. Herbalists claim that turmeric powder reduces inflammation linked with gum disease by inhibiting the action of a gene that produces gum-irritating chemicals. This effect deprives bacteria a site for growth, aiding in the prevention of both bad breath and gum disease. Don't take too much turmeric, however, because it can lead to stomach upset.