There are a few reasons why our teeth can become stained. Some reason include:  food, drinks, smoking, and even just aging.

How to prevent teeth staining?

When it comes to preventing your teeth from staining, it can easily be avoided by certain foods and beverages we use everyday. Foods that are bright in color usually help in staining your teeth. Stopping smoking is another huge way to prevent discoloration towards your teeth. Drinks that are also bright colored like food help contribute to staining. Try avoiding red wines, coffee and tea, and even sodas.

Do my teeth just stain on the outside?

There are three ways teeth are stained: surface stains, below the surface stains, and stains related to age.