Do …

… avoid prolonged exposure to foods and beverages that stain your teeth. That includes coffee, tea, berries, red wine, dark fruit juices, dark sodas, curry and soy sauce.

… try to use a straw when drinking stain-causing beverages. That way, most of the liquid bypasses your front teeth.

… brush or rinse immediately after consuming stain-causing beverages or foods. That way, stains don't have as much chance to set in. Try Aquafresh Advanced 2X Whitening or White & Shine pastes.

… brush and floss regularly and maintain good oral health habits. Visit your dentist for check-ups twice a year.

… whiten again when you see that the effects are noticeably fading. Every six months is typical, but for some people, it may be a year before you need another round.

Don't …

… go whiter than the whites of your eyes. Anything brighter may look unnatural. And yes, celebrities' teeth always look blindingly white, but unless you plan to spend most of your life in front of bright lights and a camera, don't overdo it.

… smoke. Not only does smoking stain teeth, it can also cause a myriad of oral health issues.