Feel the crunch

"Foods that are high in cellulose--a strong starchlike compound found in celery, carrots, and apples--act as natural abrasives, cleansing teeth and removing surface stains naturally," says Jeff Golub-Evans, D.D.S., a cosmetic dentist in New York City. And greens such as spinach, broccoli, and lettuce contain mineral compounds that form a film over the teeth, so pigments from other foods can't stain.