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2. What Is Teeth Whitening?
There are two main methods of bleaching. The first involves applying a high concentration of
oxidising agent for a short period of time, which is the so-called office bleach. This produces quick
results but risks chemical burns to the soft tissues. Therefore, most in-office bleaching procedures use a light-
cured protective layer that is carefully painted on the gums and papilla (the tips of the gums between the
teeth). The bleaching agent is either carbamide peroxide, which breaks down in the mouth to form hydrogen
peroxide, or hydrogen peroxide itself. The bleaching gel typically contains up to 35% hydrogen peroxide
equivalent.
The alternative method involves using a thin mouthguard or strip to hold a low concentration of
oxidising agent next to the teeth for as long as several hours a day for a period of 5 to 14 days. This is
known as take-home or over-the-counter bleaching. This is a slower process but has fewer risks to the
soft tissues. The bleaching agent is typically less than 10% hydrogen peroxide equivalent.
A typical course of bleaching can produce dramatic improvements in the cosmetic appearance of most
stained teeth; however, some stains do not respond to bleaching. Tetracycline staining may require
prolonged bleaching, as it takes longer for the bleach to reach the dentine layer. White-spot
decalcifications may also be highlighted and become more noticeable.
Recently, efforts have been made to accelerate the bleaching process by the use of light. Studies have
shown varying results as to the efficacy of light-activated bleaching.
Side effects of tooth bleaching include chemical burns (if a high-concentration oxidizing agent
contacts unprotected tissues, which may bleach or discolor mucous membranes), sensitive teeth, and
over bleaching (known in the profession as "fridge-door teeth"). Rebound, or teeth losing the bleached
effect and darkening, is also an issue, with some studies showing the rebound effect over 30 days. A
recent study by Kugel et al has shown that as much as 4 shades of lightness can be lost over 30 days
with light-activated/office bleaching.