Nearly all effective products for teeth whitening use the same active ingredients, called “peroxides.” Peroxides are extremely volatile oxygen molecules that, for a clearer smile, kill stains and bleach your teeth. Professional products ensure that all the teeth are evenly whitened and that the peroxides do not harm your gums.
Teeth whitening, whether it is caused by dark colored food and drinks, cigarette use, or the normal aging process, is beneficial for any external tooth stain. Teeth whitening, however, can not be used for the prevention of internal discoloration.