What causes stained or yellow teeth?
The most common types of teeth stains are surface stains on the enamel or beneath the enamel. Surface stains are caused by foods, beverages and other behaviors, like smoking. Over time, surface stains may penetrate the enamel and change the color of the tooth.
Kickstarting treatment with Philips Whitening Gel, and maintaining progress with Candid Whitening Foam, is a great way to mitigate any existing stains already present on your teeth.