Teeth bleaching (also called teeth whitening) is a cosmetic procedure to lighten the color of your teeth and remove stains or discoloration. Here's a quick breakdown: 🦷 Types of Teeth Bleaching In-Office Whitening (Professional) Done by a dentist. Stronger bleaching agents (usually hydrogen peroxide). Faster results (often in just one visit). Sometimes involves laser or light activation. At-Home Kits (From a Dentist) Custom trays with professional-grade whitening gel. Slower than in-office, but very effective over time. Over-the-Counter Products Whitening strips, pens, toothpaste, or trays. Less concentrated bleach, so they take longer and might not be as dramatic.