Teeth and gums connected with the black need to actively seek medical examination, if the black part is pigmentation or tartar, you need to scaling; if the black part is caries, you need to fill the treatment. 1. Pigmentation or tartar: can be scaling, professional term gingival scaling, refers to the ultrasonic high-frequency vibration effect to remove tartar, plaque and stains on the gums, and polish the surface of the teeth to delay plaque and tartar redeposition. Through scaling and polishing can effectively remove the pigmentation or black tartar formed at the junction of teeth and gums. 2. Dental caries: filling treatment is needed, which is often referred to as dental fillings. If the black color formed at the teeth and gums is carious, or accompanied by defects in the dental tissues or hot and cold sensitivity discomfort, etc., it is necessary to actively carry out dental fillings. The main steps are: removing the black decay and preparing the cavity; disinfecting the cavity; applying bonding agent and filling the cavity. The black color of the tooth-gingival joint should be clarified and treated under the guidance of a doctor.