Decay. Trauma. Gum recession exposing a dark root. A dead or receded nerve in the tooth. An existing root canal treatment. An old silver filling that has leeched gray color into the tooth. An old composite filling that is staining underneath the edges or has discolored over time. Tooth wear leading to the exposure of the darker layer of tooth under the enamel. Stain from food or beverages.
Discolored teeth are more common in people who have: Poor oral hygiene. Periodontal disease. Existing root canal treatments and old fillings. Bite problems. A smoking habit.
Consult your dentist regarding your particular situation. Some options that may be recommended are: Repair decayed teeth. Treat teeth needing root canal treatments. Address exposed tooth roots. Replace old fillings. Address bite problems. Bleach the inside of root canal treated teeth or use dental whitening products (at home or in-office).
Unless addressed, the appearance of a discolored tooth can worsen over time. In some cases, the discoloration indicates decay or a dead nerve. This can lead to a severe infection or the loss of your tooth.