Why Teeth Get Dark
There are many causes of tooth discoloration. The most common include genetics, aging, consumption of staining substances (smoking, coffee, tea, and colas), tetracycline (antibiotic) staining, excessive fluoride, and old fillings. Whitening toothpaste can remove stain that is on the outside of the teeth. Dentists call this extrinsic staining. However, whitening toothpaste and professional dental cleanings will not change the color or intrinsic staining of the teeth. That is why tooth whitening (sometimes called tooth bleaching) is so popular
Here's How Tray Teeth Whitening Works
A whitening gel is placed in a tray that fits over your teeth. As the active ingredient in the gel, carbamide peroxide, is broken down, oxygen enters the enamel and bleaches the colored substances. The structure of the tooth is notchanged; only the tooth is made lighter and whiter. Fillings, Crowns, and Bonding will not lighten.
The fit of the tray is critical to success of treatment. Impressions are made by your dentist. Accurate models of your teeth are obtained from which custom fitting whitening trays can be made.
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