Tooth discoloration comes about due to staining. Stains are caused by everything from specific foods to specific beverages to a lack of dental hygiene and more. The most prominent types of teeth stains include the following.
Extrinsic Stains
As was noted above, extrinsic staining is staining that occurs on the surface of the teeth. It occurs when pigmented particles get caught under the protein film that builds over the tooth enamel. It's most commonly caused by the regular use of tobacco, wine, or soda, though it can be caused by other foods as well.
Extrinsic stains can often be removed with the regular use of whitening toothpaste. Note, though, that that's not always the case.
Intrinsic Stains
Intrinsic stains form due to small cracks in the tooth enamel. Brightly pigmented particles work their way through these cracks, staining the inside of the tooth. Like extrinsic stains, intrinsic stains are often caused by soda, wine, and tobacco consumption.
These stains are much more difficult to remove, as it's difficult for whitening toothpaste to reach them. That said, with the use of high-powered whitening agents, this type of tooth discoloration can be eliminated.
Aging Stains
As you age, the enamel of your teeth grows thinner. At the same time, the dentin of your teeth becomes more yellow. This, combined with any intrinsic staining that your teeth might have incurred, leads to a fairly noticeable staining effect.
In most cases, teeth whitening will help in reducing age-related stains. If you're interested, inform your dentist. He or she will help you determine whether you're a viable candidate.
White Stains
One more type of stain that you'll need to look out for is the white stain. White stains on teeth are caused by a variety of factors, from poor hygiene to too much fluoride exposure to eating bad foods and more. Fortunately, they can be combated.
Generally speaking, professional teeth whitening alone will help to do away with these stains. However, in other cases, procedures like enamel microabrasion might be needed. In any case, if you're dealing with white stains on teeth, your dentist can help you.