The first few days after receiving a teeth whitening treatment are definitely the most crucial to seeing positive changes, regardless of whether you sought professional treatment or used over-the-counter products. Teeth are actually more likely to stain after undergoing a whitening treatment, so special care should be made to make the right choices as far as food and beverage are concerned, in addition to paying extra attention to brushing and flossing. When in doubt, approach your post-treatment teeth as you would a freshly laundered and pressed white shirt: it’d be a real shame to taint that crisp brightness that is so sought after.