Plaque staining is also a type of external staining that occurs with insufficient thorough oral hygiene.
The problem can be solved immediately by professional calculus cleaning and sandblasting - the result will be maintained by the patient with the proper use of toothbrushes and dental floss.
Internal staining can be caused genetically, due to disease, medications, or, most commonly, due to tooth avitality. After dental treatment, for various reasons, the tooth may take on a different, grayish color. In this case, internal whitening is indicated at the dentist.
Not all stains are pathological, so it is normal to expect that teeth will turn yellow as they age. This is due to the physiological darkening of the dentinal tissue located just below the enamel.