The black color of dental calculus is caused by bacterial clumps adhering to the calculus over a long period of time, and it can also be caused by pigmentation on the calculus over time, which results in the black color of the calculus. The calculus starts out as a yellowish color and can become black if a bacterial mass adheres to it, or if it becomes hyperpigmented over time. The calculus will continue to irritate the gums, which can cause a series of gum diseases, such as gingivitis, bleeding gums, etc., so it is recommended to choose timely treatment. Black plaque can be treated by scaling to restore periodontal health, scaling can effectively remove plaque, usually half a year to a year or so need to be scaled, so that the periodontal health can be more stable. The appearance of black calculus, it is recommended that patients go to the hospital in a timely manner, under the guidance of the doctor to take the scaling treatment, do not ignore the symptoms, to take it lightly.