Did you know that tooth-whitening has become the number
one cosmetic dental procedure in America?
And for good reason. Most people
can achieve noticeable, even dramatic, results without much effort or cost.
Whether you are getting ready for a big event, interview or you expect to be in front of the camera, a whiter smile makes you look younger and makes your smile appear more radiant and appealing. There
are many teeth whitening
systems and products including whitening toothpastes,
over-the-counter gels, rinses, strips, trays, and whitening products obtained
from a dentist. I’ll go over all of your
options in this article.
Should
You Whiten Your Teeth?
Teeth whitening
is ideal for people who have healthy, unrestored teeth (no fillings) and gums. If
your teeth have been competently restored, whitening is not a problem, except
that the filling might stand out if it was color-matched to darkened
teeth. Individuals with yellow tones to
their teeth respond best. But this cosmetic procedure is not recommended for
everyone.
Whitening is not recommended or will be less successful
in the following circumstances:
·
Age and pregnancy issues. Bleaching
is not recommended in children under the age of 16. This is because the pulp
chamber, or nerve of the tooth, is enlarged until this age. Teeth whitening
under this condition could irritate the pulp or cause it to become sensitive.
Teeth whitening is also not recommended in pregnant or lactating women.
·
Sensitive teeth and allergies. Individuals
with sensitive teeth and gums, receding gums,
and/or defective restorations should consult with their dentist prior to using
a tooth-whitening system. Anyone allergic to peroxide (the whitening agent)
should not use a bleaching product.
·
Gum disease, worn enamel, cavities, and
exposed roots. Individuals with gum disease or teeth with worn
enamel are generally discouraged from undergoing a tooth-whitening procedure.
Cavities need to be treated before undergoing any whitening procedure. This is
because the whitening solutions penetrate into any existing decay and the inner
areas of the tooth, which can cause sensitivity. Also, whitening procedures
will not work on exposed tooth roots, because roots do not have an enamel
layer.
·
Fillings, crowns, and other
restorations. Tooth-colored fillings and resin composite
materials used in dental restorations (crowns, veneers, bonding, bridges)
do not whiten. Therefore, using a whitening agent on teeth that contain
restorations will result in uneven whitening -- in this case, making the teeth
without restorations appear lighter than those with restorations. Any whitening
procedure should be done prior to the placement of restorations.
·
People with numerous restorations that would result in
uneven whitening may be better off considering bonding, veneers, or crowns
rather than a tooth whitening system. Ask your dentist what strategy is best
for you.
·
Unrealistic expectations. Individuals
who expect their teeth to be a new "blinding white" may be
disappointed with their results. Smokers need to be aware that their results
will be limited unless they refrain from continued smoking, particularly
during the bleaching process. A healthy guide to is to achieve a shade slightly
whiter than the whites of your eyes.
·
Darkly stained teeth. Yellowish
teeth respond well to bleaching, brownish-colored teeth respond less well and
grayish-hue or purple-stained teeth may not respond to bleaching at all.
Blue-gray staining caused by the antibiotic tetracycline is more
difficult to lighten and may require up to six months of home treatments or
several in-office appointments to successfully lighten. Teeth that have dark
stains may be better candidates for another lightening option, such as veneers,
bonding, or crowns. Your dentist can discuss the options best suited for you.
Whitening
Systems Compared
Whitening Toothpastes
All toothpastes help remove surface stains, because they
contain mild abrasives. Some whitening toothpastes contain gentle polishing or
chemical agents that provide additional stain removal effectiveness. Whitening
toothpastes can help remove surface stains only and do not contain bleach; over-the-counter
and professional whitening products contain carbamide
peroxide or hydrogen
peroxide that helps lighten the color deep in the tooth.
Whitening
Power: 1 shade lighter
Whitening Rinses
Among the newest whitening products available are
whitening rinses. Like most mouthwashes, they freshen breath and help reduce
dental plaque and gum disease. But these products also include
ingredients, such as hydrogen peroxide in some, which whiten teeth. Manufacturers
say it may take 12 weeks to see results. You just swish them around in
your mouth for 60 seconds twice a day before brushing your teeth.
However, some experts say that rinses may not be as effective as other
over-the-counter whitening products. Because a whitening rinse is only in
contact with the teeth for such a short time -- just two minutes a day compared
to 30 minutes for many strips -- it may have less of an effect.
Whitening
Power: 1 shade lighter (maybe)
Over-the-Counter Whitening Strips and Gels
Whitening gels are clear, peroxide-based gels applied
with a small brush directly to the surface of your teeth. Instructions vary
depending on the strength of the peroxide. Follow the directions on the product
carefully. Initial results are seen in a few days and final results are
sustained for about four months.
Whitening strips are very thin, transparent strips that
are coated with a peroxide-based whitening gel. The strips should be applied
according to the instructions on the label. Initial results are seen in a few
days and final results are sustained for about four months.
Personally, I find the results to be less than optimal
because of (a) the incomplete contact with the tooth surface, (b) the likelihood
of ingestion of the bleaching material, and (c) the exposure to outside
surfaces of the bleaching compound.
Whitening Power: 3
(spotty) shades lighter
Tray-Based Tooth Whiteners
Tray-based tooth whitening systems, purchased either
over-the-counter or from a dentist, involve filling a mouthguard-like tray
with a gel whitening solution -- which contains a peroxide-bleaching agent. The
tray is worn for a period of time, generally from a couple of hours a day to every
day during the night for up to four weeks and even longer (depending on the
degree of discoloration and desired level of whitening).
Whitening Power: An average of 3 to 5 shades lighter
In-Office Whitening
In-office bleaching provides the quickest way to whiten
teeth. With in-office bleaching, the whitening product is applied directly to
the teeth. There is complete contact
with all visible tooth surfaces. These products can be used in combination with
a special activating light. Results are seen in only one, 30- to 60-minute
treatment. However, with in-office
bleaching, dramatic results can be seen after the first treatment. This type of
whitening is also the most expensive approach.
Whitening Power:
An average of 8 shades lighter
At
Home vs. Dentist Supervised?
Do-it-yourself methods aren't the same as getting your
teeth whitened by a professional. You'll want to consider a few important
differences.
Strength of bleaching agent. Over-the-counter
products and dentist-supervised at-home products usually contain a lower
strength bleaching agent, with about a 10% to 22% carbamide peroxide content,
which is equivalent to about 3% hydrogen peroxide. In-office, professionally
applied tooth whitening products contain hydrogen peroxide in concentrations
ranging from 15% to 43%.
Mouthpiece trays. With
dentist-supervised at-home bleaching products, your dentist will take an
impression of your teeth and make a mouthpiece tray that is customized to
exactly fit your teeth. This customization allows for maximum contact between
the whitening gel, which is applied to the mouthpiece tray, and the teeth. A
custom-made tray also minimizes the gel's contact with gum tissue.
Over-the-counter whitening products also contain a
mouthpiece tray, but the "one-size-fits-all" approach means that the
fit will not be exact. Ill-fitting trays can irritate the gum and soft tissue
by allowing more bleaching gel to seep onto these tissues. With in-office
procedures, you'll get the bleaching agent applied directly to your teeth.
Additional protective measures. In
the office setting, your dentist will apply either a gel to the gum tissue or
use a rubber shield (which slides over the teeth) prior to treatment to protect
your gums and oral cavities from the effects of the bleaching. Over-the-counter
products don't provide these extra protective measures.
Costs. Over-the-counter
bleaching systems are the least expensive option, with in-office whitening
being the costliest.
Supervised vs. unsupervised process. First,
your dentist can perform an oral exam and consider your complete medical
history, which can be helpful in determining if bleaching is an appropriate
course of treatment based on the type and extent of stains, and the number and
location of restorations. Your dentist can then better match the type of stain
with the best treatment, if appropriate, to lighten those stains.
When your dentist does it, he'll likely want to see you a
couple of times to clear up any questions about the directions, to make sure
the customized tray fits properly, to check your gums for signs of irritation,
and to generally see how the process is working. With over-the-counter
bleaching products, you're on your own.
How Long Do
Whitening Effects Last?
Teeth whitening is not permanent. People who expose their
teeth to foods and beverages that cause staining may see the whiteness start to
fade in as little as one month. Those who avoid foods and beverages that stain
may be able to wait one year or longer before another whitening treatment or
touch-up is needed.
The degree of whiteness will vary from individual to
individual depending on the condition of the teeth, the level of staining, and
the type of bleaching system used.
Risks
Associated With Whitening
The two side effects that occur most often with teeth
whitening are a temporary increase in tooth sensitivity and mild irritation of
the soft tissues of the mouth,
particularly the gums. Tooth sensitivity often occurs during early stages of
the bleaching treatment. Tissue irritation most commonly results from an
ill-fitting mouthpiece tray rather than the tooth-bleaching agent. Both of
these conditions usually are temporary and disappear within 1 to 3 days of
stopping or completing treatment.
If you do experience sensitivity, you can reduce or
eliminate it by:
- Wearing the tray for a shorter period of time (for
example, two 30-minute sessions vs. two 60-minute sessions).
- Stop whitening your teeth for 2 to 3 days to allow
teeth to adjust to the process.
- Ask your dentist or pharmacist for a high
fluoride-containing product, which can help remineralize your teeth. Apply
the fluoride product to the tray and wear for 4 minutes prior to and
following the whitening agent.
- Brush teeth with a toothpaste made for sensitive
teeth. These toothpastes contain potassium nitrate,
which helps soothe the teeth's nerve endings.
Whitening
Product Safety
Some whitening products you get through dentists' offices
as well as professionally applied (in-office) bleaching products have the
American Dental Association (ADA) Seal of Acceptance, which tells you that the
product meets ADA guidelines for safety and effectiveness. Currently, only
dentist-dispensed home-use products containing 10% carbamide peroxide and
office-applied products containing 35% hydrogen peroxide have this seal.
Over-the-counter bleaching products are not endorsed by
the ADA, because the organization believes that professional consultation is
important to ensuring safe and effective use. No whitening products using
lasers are on the ADA's list of accepted products.
Several whitening toothpastes available in drugstores
have received the seal, too. You can find a list at www.ada.org.
Not all manufacturers seek the ADA's Seal of Acceptance.
This is a voluntary program that requires considerable expense and time on the
part of a manufacturer. Just because a product doesn't have the seal does not
necessarily mean that the product isn't safe and effective.