The enamel, which is the first layer of the tooth, is in fact a transparent structure with light transparency. The dentin layer under the minen is usually yellow, but sometimes it can also be gray, brown or black. The tooth color is determined by the color of the minerals reflected and a peroxide solution is applied to the vine in order to whiten the dentin.
This process opens the pores of the minerals, allowing the solution to reach the dentin layer. The opening of the dentine color comes out as a whiter looking tooth.