12-year-old teeth with black spots may be food residues, pigmentation, caries and other reasons. 1. Food residue: some children like to eat chocolate or fruit leather, etc. When there is food residue, it will be attached to the teeth and mistaken for black spots. 2. Hyperpigmentation: Some children prefer sweets, such as soy sauce, carbonated beverages, fruit juices and other foods rich in pigment. If they don’t rinse and brush their teeth in time after eating, the pigment will be deposited on their teeth, which will become black spots in the long run. 3. Dental caries: it may be that the child usually do not pay attention to dental hygiene, long-term not brushing or like to eat acidic food, resulting in damage to tooth enamel, bacterial reproduction caused by dental caries. 12-year-old teeth with black spots, it is recommended to first rule out food adhesion caused by, and then timely medical attention, follow the doctor’s instructions for relevant examinations, in the doctor’s help to clarify the cause, and targeted treatment or treatment.