Teeth Whitening FAQ’S Answered

There are many causes of tooth staining.  Certain medications, tooth trauma, root fillings, and foods and beverages can cause tooth discoloration over time.  Some discolorations are superficial while others are more internal.  Both can be effectively treated by a dentist; professional whitening is the best option to safely whiten discolored teeth.

HOW DOES WHITENING WORK?

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The whitening process is possible due to the ability of whitening agent (carbamide peroxide and/or hydrogen peroxide) to freely pass through enamel and dentin and to permeate all parts of the tooth.  These peroxides break down into oxygen radicals, which migrate between the enamel prisms, breaking down any colored molecules that result in tooth discoloration.  The structure of the tooth is not altered.  The internal tooth color is simply made lighter

Whitening agents break down into tiny molecules and move in all directions so even if the entire tooth is not covered with bleach, the entire tooth is whitened.
Numerous studies have proven the effectiveness of peroxides in whitening teeth.  Enamel, dentin, existing fillings, and bonding materials are not affected by the whitening agents, nor are they harmed by the whitening materials.

HOW LONG DOES THE WHITENING LAST?

Whitening results are very stable, but depending on the patient’s nutrition and lifestyle habits, the procedure may need to be redone periodically.  Due to the safety of the whitening agents, this should not concern the dentist or patient.

WILL WHITENING CAUSE TOOTH SENSITIVITY?

Tooth sensitivity is a relatively common side effect of whitening.  If sensitivity occurs, it is transient and disappears after the completion of the whitening.  However, most whitening products contain desensitizing agents like potassium nitrate and fluoride for additional comfort.  Research has shown that just as hydrogen peroxide penetrates through the enamel and dentin into the pulp, so does potassium nitrate.  Potassium nitrate acts more like an analgesic or anesthetic by keeping the nerve of the tooth from sending pain signals to the brain.  Fluoride acts primarily as a dentin tube blocker, plugging the holes and slowing down the fluid flow that causes sensitivity.

WILL WHITENING WEAKEN THE TOOTH’S ENAMEL?

Findings presented at the American Association of Dental Research confirm that whitening will actually minimize sensitivity, provide anti-caries benefits, increase enamel microhardness, and improve overall enamel health.

WILL OVER-THE –COUNTER  WHITENING PRODUCTS WORK AS WELL AS PROFESSIONAL WHITENING?

Self-treatment with the use of over-the –counter (OTC) products often does not provide the results desired.  Professional tooth whitening treatments are safe if they are used appropriately and with the correct materials.  This includes an initial diagnosis, professional teeth cleaning, briefing on the chosen whitening process, and monitoring the patient during the treatment phase.

By Dr. Andrew Thompson
TenderCare Dental - Portland, Oregon
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