At Novadent we use the advanced POLA OFFICE + teeth whitening system which is clinically proven to be safe; with long lasting results for the beautiful smile you always a common procedure in general dentistry but most especially in the field of cosmetic dentistry. A child’s deciduous teeth are generally whiter than the adult teeth that follow. As a person ages the adult teeth often become darker due to changes in the mineral structure of the tooth, as the enamel becomes less porous.[citation needed] Teeth can also become stained by bacterial pigments, food-goods and vegetables