The most common cause of darker pigments in the gums is genetics. Excess melanin can build up in the gums, making them look brown or black instead of pink. Other causes for dark gums include smoking, side effects from certain medications, and the possible effect of amalgam fillings on the gum. Dentpark Multispeciality Dental Clinic is one of the only clinics to offer Laser Gum Bleaching ( Depigmentation ). For more details please contact us 8826066352.