A common cause of discoloration is the build-up of dental plaque (a deposit of food particles, saliva, and bacteria) on the surface of the teeth. Plaque-stained teeth are often yellowish-brown, but children's teeth may be black or green. Regularly drinking tea and coffee and using tobacco may also stain the surface of the teeth, as may some liquid medicines that contain iron.
What might be done?
Staining on the surface of the teeth is routinely removed by scaling and polishing of teeth by your dentist or oral hygienist. If staining is severe, the teeth can be bleached. If a single tooth is discoloured as a result of a condition such as pulpitis or following root canal treatment, a porcelain or plastic veneer may be bonded to the front of the tooth, or the top of the tooth can be replaced by a crown