Some stains on your teeth don’t react to whitening toothpastes because they become part of the internal structure of the tooth. However, if you use a whitening toothpaste, many of your deep set stains may diminish, depending on the source of the stain and how long it's been there.
Unlike whitening toothpaste, whiteners such as whitening strips or whitening gels are not designed to remove plaque and keep your teeth clean. These products only contain whitening ingredients and do not protect teeth against cavities. Whitening toothpastes are specially formulated to clean and protect your teeth while working to remove stains at the same time.