Teeth Whitening and Bleaching
Unlike temporary teeth which are shiny, very white and very clean looking, the permanent teeth that follow once the deciduous teeth are lost are usually less porous. Because of this, permanent teeth come in varying shades from white to off-white and sometimes to yellowish. It could shade darker as the person grows older, perfectly normal.
While the darkening of the teeth as it ages is mainly due to the changes in the teeth's mineral structure, the enamel at the same time gets less porous and less shiny making it more susceptible to stains from bacterial pigments, medication, tobacco, wine, coffee, tea and food. No matter how good the hygiene of a person is, the teeth simply ages. Rightly or wrongly, white brilliant teeth are attributed to health, youth, good grooming and being clean.