Dark gums may be caused by a number of things, including skin pigment balance, smoking, use of certain drugs, dental procedures and disease. To ensure good health for teeth and gums, dentists recommend brushing regularly and practicing good oral care, according to Water Tower Dental Care.
People with dark skin or those who are not of the Caucasian race may have darker gums as a result of natural skin pigment balance. Other people may develop dark gums as a result of smoking cigarettes or taking drugs, such as minocycline and tricycline. Dental procedures such as metal-based crown filings may also cause a darkening of gums. Medical conditions like black gum disease and acute necrotizing ulcerative disease may also lead to a darkening of gums.