The darkening of the root of the tooth is considered to be caused by calculus attachment, or may be the emergence of caries, need to be based on the cause of the general treatment or medication, etc.. 1. If the blackening of tooth roots is caused by the attachment of dental calculus, you need to consult a doctor in time for ultrasonic dental cleaning, which can remove dental calculus and tooth surface pigmentation, and solve the symptom of blackening of tooth roots. Usually also need to pay attention to oral hygiene, diligent use of dental floss or dental flosser. 2. Caries, if caries, according to the severity of caries need to be composite resin filling restoration, glass ionomer cementum restoration, you can also choose to carry out root canal treatment. Usually need to observe the teeth, if there are obvious symptoms of blackening of the roots of the teeth, you need to actively seek medical attention.