Teeth naturally darken with age as the outer enamel wears down, revealing a yellowish layer underneath. Other common causes of discoloration include smoking, and consuming coffee, tea, wine, or certain medications. Even excessive fluoride exposure (fluorosis) during childhood can contribute to staining. It’s essential to consult your dentist to determine if you’re a good candidate for teeth whitening, as some stains, like those from tetracycline or fluorosis, may not respond well to bleaching.

Teeth whitening is not permanent, so you may need touch-ups every few years to maintain a bright smile. Your dentist can also recommend treatments like veneers or crowns for stains that are difficult to bleach. Additionally, whitening only affects natural tooth enamel, so any old fillings or crowns should be replaced after whitening to match your new shade.