Whitening agents are substances used to lighten the color of materials, commonly found in products like laundry detergents and teeth whitening treatments. They work by breaking down stains or discoloration, making surfaces appear brighter and cleaner. In dental care, whitening agents often contain hydrogen peroxide or carbamide peroxide, which penetrate the enamel to remove stains caused by food, drinks, or smoking. These agents can be found in over-the-counter products or professional treatments provided by dentists, helping individuals achieve a whiter smile.