Andrey Popov/Shutterstock Whiter teeth can give you a brighter smile and the appearance of a young, fresh mouth. (You can even whiten your teeth naturally at home .) "Yellow or discolored teeth makes people look older and less attractive," says dentist Nancy Rosen , DMD. You can have your teeth whitened by your dentist in the office with a procedure called Zoom Advanced Whitening , which is the most effective way, she says. Or, "if someone chooses the over-the-counter method, they should make sure they follow the directions. My favorite OTC whitening products are the Crest White Strips."