Tooth whitening is a cosmetic dental procedure that can whiten teeth that have become discolored due to a variety of factors. There are a variety of tooth whitening methods available, from over-the-counter products to professional treatments. Professional tooth whitening is more effective than over-the-counter products and can deliver more noticeable results. However, it is important to consult with a dentist before undergoing tooth whitening to ensure that it is safe and appropriate for you. After tooth whitening, it is important to maintain the results by brushing and flossing regularly and avoiding staining substances.