Levine urges the importance of a great home care routine. That means teaching yourself to clock in a full two minutes (no cheating!) of brushing twice a day and flossing once a day. "If the plaque is cleaned off the teeth effectively, foods and liquids will not stick to them and thus [create fewer] external stains," Levine explains.

If your coffee or red wine habits start to dull those pearly whites, it's safe to maintain your smile with once-a-month whitening sessions.