Process at home. Using at-home commercial products is an easy way to achieve brightened teeth. They white the teeth with the exact same kind of ingredients that the dentists use, but at a lower concentration, usually as low as 3%. This lower amount of ingredients can remove surface stains but may not penetrate down to your intrinsic layer to remove deeper discoloration. Whitening toothpastes, strips, and mouthwash are very convenient to obtain and use. Make sure to research trusted brands and look over the ingredients to make sure they are proven teeth whitening agents.