Tooth-bleaching: Better left up to a dentist
With the advent of new treatments, a better smile is now within reach
of more people. One of the most popular cosmetic procedures is bleaching.
The natural light ivory color of enamel can turn to yellow, orange,
brown, gray—even blue or green. Causes of discoloration include
staining from coffee or tobacco, injury that has damaged the pulp,
ingestion of the antibiotic tetracycline or high levels of fluoride
while the teeth are developing, corrosion from silver fillings, and
the natural wearing away of the enamel with age.
Although many stains can be successfully removed with a bleaching technique,
bleaching may be uncomfortable for people with sensitive teeth or an
exposed root. Several different bleaching techniques are available.
Your dentist etches your teeth with an acid solution and then applies
an oxidizing agent to the enamel. Your teeth are exposed to a bright
light or a laser to hasten the lightening. It usually takes three to
four sessions, each lasting about 30–60 minutes, to achieve the
color you want. A newer technique, called power bleaching, uses a highly
concentrated form of hydrogen peroxide as the lightening agent. It can
deliver results in just one session. Bleaching is temporary, however.
Your teeth will darken again within one to three years, and you may need
to repeat the procedure. Costs vary, with some dentists charging a fee
$75 and $225 a session, and others charging a single fee of $300 or more.
Home bleaching (dentist prescribed)
Your dentist will make a custom-fitted mouthpiece to hold the bleaching
chemicals (carbamide peroxide or hydrogen peroxide). You then perform
the bleaching at home by spreading the chemicals into the mouthpiece
and putting it on for the recommended period (between 30 minutes and
several hours) each day for a week or two. This procedure generally costs
between $200 and $600.
Bleaching pulp-damaged teeth
When the pulp is dead or injured, the tooth will darken. To correct
this problem, your dentist can rinse the pulp chamber with a bleaching
agent while performing root canal therapy. If the stain persists or the
tooth darkens after the root canal is completed, your dentist can reopen
the pulp chamber and fill it with bleach for several minutes under a
heat light. This process may have to be repeated several times. Alternately,
the dentist can fill the pulp chamber with bleaching solution and cover
it with a temporary filling. In this case, you’ll need to return
after a few days to have the bleach removed and the tooth permanently
sealed. Costs vary; some practices charge between $300 and $400 per tooth.
Over-the-counter bleaching kits
These kits operate on the same principles as the professional products.
You start with an acid rinse, then apply a hydrogen peroxide gel, and
finally coat the tooth with a whitening pigment. Many over-the-counter
tooth whitening strips or kits cost as little as $15 to $40.
Although many consumers opt for this bleaching method because it is
less expensive than other techniques, the Food and Drug Administration
raises several concerns about these kits. Without professional diagnosis,
it’s hard to determine the source of discoloration and the effectiveness
of the bleaching agent, so good results cannot be ensured. In addition,
there is not yet enough information to determine the long-term safety
of these products.
July 2003 Update
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