There is no such thing as permanent teeth whitening. Although tooth enamel looks very hard and smooth, it contains micropores. In any case, teeth whitening applications consist of removing the coloring matter in these pores. After the whitening treatments, these pores will be filled again with the effect of time and food and the perfect whiteness will disappear. Although it varies from person to person, teeth whitening applications should be repeated between 6 months and 2 years.