Brushing and flossing are everyday ways to keep your teeth
bright, white and healthy. Still, if you might feel like your smile is lacking
some sparkle or is more yellow than it used to be, you’re not alone. When the
American Academy of Cosmetic Dentistry asked people what they’d most like to
improve about their smile, the most common response was whiter teeth. The
American Association of Orthodontists also found that nearly 90% of patients
requested tooth whitening.
Thinking about teeth whitening? Get the facts first. Here are
five of the most commonly asked questions about the process.
Why Did My Teeth Change Color?
Over time, your
teeth can go from white to not-so-bright for several reasons:
Food and
Drink:
Coffee, tea and red wine are some major staining culprits.
What do they have in common? Intense color pigments called chromogens that
attach to the white, outer part of your tooth (enamel).
Tobacco
Use:
Two chemicals found in tobacco create stubborn stains: Tar and nicotine. Tar is naturally
dark. Nicotine is colorless until it’s mixed with oxygen. Then, it turns into a
yellowish, surface-staining substance.
Age:
Below the hard, white outer shell of your teeth (enamel) is a
softer area called dentin. Over time, the outer enamel layer gets thinner with
brushing and more of the yellowish dentin shows through.
Trauma:
If you’ve been hit in the mouth, your teeth may change color
because it reacts to an injury by laying down more dentin, which is a darker
layer under the enamel.
Medications:
Tooth darkening can be a side effect of certain antihistamines, antipsychotics and high blood pressure medications. Young children who are exposed to antibiotics like tetracycline and doxycycline when their teeth are forming (either in the womb or as a baby) may have discoloration of their adult teeth later in life. Chemotherapy radiation for the head and neck can also darken teeth.
How Does Teeth Whitening Work?
Teeth whitening is a simple process. Whitening products
contain one of two tooth bleaches (hydrogen peroxide or carbamide peroxide).
These bleaches break stains into smaller pieces, which makes the color less
concentrated and your teeth brighter.
Does
Whitening Work on All Teeth?
No, which is why it’s important to talk to your dentist
before deciding to whiten your teeth, as whiteners may not correct all types of
discoloration. For example, yellow teeth will probably bleach well, brown teeth
may not respond as well and teeth with gray tones may not bleach at all.
Whitening will not work on caps, veneers, crowns or fillings. It also won’t be
effective if your tooth discoloration is caused by medications or a tooth
injury.
What Are My Whitening Options?
Talk to your dentist before starting. If you are a candidate,
there are four ways to put the shine back in your smile:
Stain
Removal Toothpastes:
All kinds of toothpastes help remove surface stains through
the action of mild abrasives that scrub the teeth. Look for a whitening toothpaste
that has earned the ADA Seal of Acceptance for stain removal (it will tell you
on the package). These kinds of toothpaste have additional polishing agents
that are safe for your teeth and provide stain removal effectiveness. Unlike
bleaches, these types of ADA-Accepted products do not change the color of teeth
because they can only remove stains on the surface.
In-Office
Bleaching:
This procedure is called chairside bleaching and usually
requires only one office visit. The dentist will apply either a protective gel
to your gums or a rubber shield to protect your gums. Bleach is then applied to
the teeth.
At-Home
Bleaching from Your Dentist:
Your dentist can provide you with a custom-made tray for
at-home whitening. In this case, the dentist will give you instructions on how
to place the bleaching solution in the tray and for what length of time. This
may be a preferred option if you feel more comfortable whitening in your own
home at a slower pace, but still with the guidance of a dentist. Out-of-office
bleaching can take anywhere from a few days to a few weeks.
Over-the-Counter
Bleaching Products:
You may see different options online or in your local grocery
store, such as a paste or strips that whiten by bleaching your teeth. The
concentration of the bleaching agent in these products is lower than what your
dentist would use in the office. If you are thinking about using an
over-the-counter bleaching kit, discuss options with your dentist and look for
one with the ADA Seal of Acceptance. That means it has been tested to be safe
and effective for teeth whitening. Get a list of all ADA-Accepted at-home
bleaching products.
Are There Any Side Effects from Teeth Whitening?
Some people who use teeth whiteners may experience tooth
sensitivity. This happens when the peroxide in the whitener gets through the
enamel to the soft layer of dentin and irritates the nerve of your tooth. In
most cases the sensitivity is temporary. You can delay treatment, then try
again.
Overuse of whiteners can also
damage the tooth enamel or gums, so be sure to follow directions and talk to
your dentist.