How does teeth whitening achieve results?
The bleaching gel is usually hydrogen or carbamide peroxide that breaks down into oxygen molecules. These molecules go into the tiny pores of the enamel and dentin and break up the stains that block out the light. More light passes through the teeth and makes them look lighter as the stains are broken into smaller and smaller pieces. Stains that are accumulated over time that are yellow to slightly brown produce the best results. Teeth that are dark brown to blue-grey are the most difficult to bleach because the stain is deeply embedded in the structure of the tooth. These types of stains are usually caused by medications taken during the development of the teeth such as tetracycline and can take a minimum of three weeks to see results and as much as six months for complete results. Results can be seen within an hour, overnight or within three to four days depending on the bleaching gel used and the length of time it is worn. Complete results can be achieved in as little as a week or a
