Stained teeth can be the result of stains that are either extrinsic or intrinsic:
There are many reasons why stains may appear on the teeth. There are environmental factors (such as fluorosis, a condition that can be caused by excessive consumption of the fluorine compounds often found in tap water), medical factors, such as being exposed to antibiotic therapy during tooth development, which can result in tetracycline staining, and genetic factors, which influence the growth and color of teeth.
Many people consider stains unsightly, as they are often associated with poor oral health and hygiene. As a result teeth whitening treatments, which can reduce the appearance of extrinsic stains, continue to grow globally in popularity.
Intrinsic discolouration, however, can be more difficult to manage. These stains usually can’t be removed but they can be covered or concealed with composite bonding material or veneers.