Tooth whitening is a procedure that lightens the yellowing of enamel and dentin. Discolorations within the tooth will be lightened. Stains are removed and a whiter brighter smile is created. Tooth whitening will make teeth appear whiter. A product is deemed simply "whitening" when it eliminates food or debris from the teeth without bleach. It has been shown to be highly effective at removing stains from teeth, including tobacco, coffee, tea, tetracycline, and various other tooth stains.

The whitening procedure involves the application of a tooth whitening gel containing between 25% to 40% hydrogen peroxide. A protecting barrier is used during the whitening process to keep your lips, gums, and tongue away from the whitening gel so it stays in place on your teeth.

Published studies showed that use of teeth whitening products using 10% carbamide peroxide showed no effect on the hardness or mineral content of a tooth’s enamel surface. 
Teeth whitening is not permanent but by following some simple post whitening care instructions, your teeth will always be lighter than they were before. To keep your teeth looking their best, we recommend flossing, brushing twice daily. 
The complete chairside procedure takes less than an hour. It begins with a preparation period followed as little as by 45 minutes of whitening. 
Teeth whitening may affect sensitivity throughout or after treatment and slight discomfort in the gums. Both of these side effects are usually temporary and will fade away a few days after treatment.
Almost anyone. However, treatment may not be as effective or some as it is for others. The amount of whitening varies from client to client and cannot be predicted or assured but in general use, teeth may lighten anywhere from 6 to 12 shades on the whitening shade guide.