According to the FDA the term bleaching is permitted to be used only when the teeth can be whitened beyond their natural color . this applies strictly to products that contain bleach typically hydrogen peroxide or carbamide peroxide.
The term whitening on the other hand refers to restoring a tooth surface color by removing dirt and debris . so any product that contains bleach is considered whitener. Of course , the term whitening sounds better than bleaching , so it is more frequently used even when deserving products that contain bleach the procedure to bleach teeth uses oxidizing agents such as hydrogen peroxide or carbuncle peroxide to lighten the shade of the tooth , the oxidizing agent penetrates the porosities in the rod like a crystal structure of enamel and oxidizes interprismatic stain deposits , over a period of time, the dentin layer , lying underneath the enamel is also bleached. The effe3cts of bleaching can last for several months, but may be shortened by cigarette smoking , tea and coffee consumptions. |
