Research indicates that whitening teeth with carbamide peroxide under the supervision of a dentist is safe for teeth and gums. The bleaching gel is placed in a thin custom fitted bleaching tray that fits over your teeth. As the active ingredient in the gel, carbamide peroxide, is broken down, oxygen enters the enamel and bleaches the colored substances. Results are usually seen within the first couple of days. Maximum results generally occur when the process is continued for 10 to 14 days.
Some people experience increased tooth sensitivity from cold liquids.
Others have reported temporary discomfort, such as gum or tooth sensitivity. These symptoms always disappear within 1-3 days after interruption or completion of the treatment. The teeth will always be lighter than they were. However, the solution that is employed has been safely used for many years in the treatment of gums and other oral soft tissue. The whitening process is most effective on mildly discolored teeth.