Which of the following is an indication for tooth whitening?

Tooth whitening is a cosmetic dental procedure aimed at enhancing the appearance of teeth by making them whiter and brighter. The procedure can address various types of discoloration found in teeth.

Intrinsic stains, which occur within the tooth structure, often result from factors like genetics, certain medications, or exposure to excess fluoride during childhood. Tooth whitening is effective for these types of stains, as the whitening agents can penetrate the enamel and reach the underlying dentin.

Extrinsic stains, on the other hand, are primarily caused by external factors such as food, beverages (like coffee or red wine), and tobacco use. These stains usually affect the outer layer of the teeth and can be effectively removed through tooth whitening treatments.

Aged teeth can also be an indication for whitening. As a person ages, the enamel wear may expose the dentin more, causing a yellowing effect. This yellowing can be addressed through whitening treatments as well.

Since tooth whitening can effectively treat intrinsic stains, extrinsic stains, and the discoloration associated with aging, it is clear that all these factors are valid indications for tooth whitening. Therefore, the most comprehensive answer that encompasses all potential scenarios is indeed that all of the above are indications for tooth whitening.