Tooth stains are unsightly. No matter how much you brush and floss, it may feel like some of that discoloration just won’t go away. And, after all, who doesn’t want whiter teeth? Celebrities flash their pearly whites at every opportunity. But here’s a big secret: The stars aren’t getting those white smiles by using over-the-counter teeth whitening products. More often than not, celebs rely on one of two cosmetic dentistry treatments: porcelain veneers or professional teeth whitening treatments.