Understanding Teeth Whitening Teeth whitening is a cosmetic dental procedure that removes stains and discoloration from your teeth. It helps restore the natural whiteness of your teeth and improves your smile. Professional teeth whitening performed by a dentist is much more effective and safer than home remedies. Why Do Teeth Become Yellow? There are several reasons why teeth lose their whiteness: Drinking tea, coffee, or soft drinks Smoking or tobacco use Poor oral hygiene A