The color of our teeth is visualized as the reflection of light scattering off the enamel as well as the color of the dentin under it. Every day, a thin coating (pellicle) forms on the enamel and picks up stains.
The most common reasons for teeth stains are:
Drinking dark-colored liquids such as coffee, cola, tea and red wine
Not taking good care of your teeth
Aging (enamel gets thinner and the dentin becomes dark)
Teeth whitening lightens teeth and helps to remove stains and discoloration. Whitening is among the most popular cosmetic dental procedures because it can greatly improve how your teeth look.