"You can go about your day because you've created a slippery protective shield over your teeth that food and drink particles that cause staining won't be able to attach," she says.
Don't bother with the lemon rinds
Rumor has it that rubbing lemon rinds and even crushed strawberries against your teeth will whiten them.
"These foods contain a lot of citric acid which can cause tooth damage instead of making them sparkle," said Dr. Rappaport.
Pretty much every other dentist we spoke with said the same: Avoid the citrus, in paste form, juice form, or rind form… the high acidity level actually wears enamel away.
You may want to try activated charcoal (sparingly)
Activated charcoal is the newest kid on the block when it comes to whitening.
This isn't a return to medieval Japanese beauty standards: It comes in a color-free paste form from Dr. Brite. If you're into the whole black look, though, it comes in a black variation from Marvelous ToothCare that is literally like dipping your toothbrush into black paint, causing a dark foam to coat your lips (which is actually kind of fun) and even by the fourth rinse, you're spitting gray. (I scared the crap out of my fiancé. Deranged face-making optional.)