Darkening under the gums may be caused by physiological factors such as long-term smoking, use of heavy metal-containing substances, or by diseases such as caries and dental calculus.
1. Physiological factors: If long-term smoking, due to long-term exposure of the gums to tobacco fumigation, brown pigmentation can occur. Or may be long-term consumption of lead-containing tin pots drinking alcohol, daily use of mercury-containing cosmetics, will lead to the body to produce chronic lead and mercury poisoning, thus causing black gums.
2. Caries: Caries may be caused by bacteria, improper diet, gum recession and other factors. Patients will appear tooth surface pigmentation, and with the development of the disease, there can be obvious caries holes, manifested as darkness under the gums.
3. Dental calculus: dental calculus may be caused by plaque, bacterial infection, improper diet, smoking and other factors. Patients may have brownish-black tartar on the surface of the teeth, which may appear as darkening under the gums.
There are many reasons that lead to blackness under the gums, and it is recommended that patients go to regular hospitals and undergo relevant examinations so as to identify the causes.