If there is something black in the gap between the teeth that cannot be picked out, it may be food debris stuck in the gap and you can try to clean it with dental floss or toothbrush. If cleaning does not remove it and the cause of food debris is ruled out, then consider the symptoms of blackened teeth. This is usually caused by food debris stuck in between the teeth after eating and not being cleaned in time, resulting in tooth lesions. Common cases and treatment include the following: 1, pigmentation: the appearance of black teeth gap symptoms, may be related to the usual hobbies, such as frequent consumption of strong tea, coffee, betel nut and other dark food, or frequent smoking, may lead to dental pigmentation, black teeth gap, generally can be cleaned by scaling; 2, dental caries: patients with black teeth gap may also be related to the patient’s dental caries, which is often referred to as Tooth decay. Because the food residue is not cleaned for a long time, it causes the teeth to indicate bacterial reproduction, resulting in tooth corrosion and blackening or cavity. You can go to dental clinic for medical treatment and choose filling, root canal treatment or extraction treatment according to the specific situation of tooth decay; 3, calculus: calculus is the name of the material formed by mineralized plaque and other deposits attached on the teeth, which is often found on the lingual side of the lower front teeth and the buccal side of the upper molars, etc. The calculus deposited at the gap of teeth is darker and may appear black, usually you can choose ultrasonic Ultrasonic scaling is usually an option for treatment. In daily life, you should properly use dental floss, flosser, toothbrush, etc. to better clean your teeth, but you should pay attention to avoid damaging the gums, and also go to the hospital for consultation and dental cleaning or repair, etc. according to your situation.