The most difficult to bleach teeth are the dark blue, green, brown stains. These types of stains are usually caused by medication. You can get the best stain fighting results from the yellow slightly brown colored teeth.

Depending upon the type of teeth whitening you receive—results can be seen within an hour to sometimes a week. However, the entire process can take from one week to several months depending on where the stains have originated. If the tooth is really difficult to bleach, the process can actually take up to three years and sometimes longer (and this generally depends on the person and how they maintain their teeth).

The Risks of Bleaching

The side effects of teeth whitening bleaching can be from tenderness in the soft tissue areas, such as the gums and tongue areas, and possibly pain. It is also possible to over-bleach the teeth—when this happens, the tooth will have a translucent effect and appear slightly gray in the light.

In regards to home bleaching, there is just a small risk of ingesting the bleaching gel and in worst cases can cause you to vomit, have nausea and a burning sensation in which you would need to call a doctor immediately.

Teeth whitening bleaching gel can remain unrefrigerated for up to 1 year and 2 years refrigerator.

Does Bleaching Cause Cancer?

In regards to some reports stating that there is a link between teeth bleaching and cancer, the American Dental Association has proved that the teeth bleaching and cancer findings are incorrect. The ADA states, “carbamide peroxide and hydrogen peroxide chemicals generated in the whitening process aren’t carcinogens in the mouth”. The ADA has gone on to monitor the effects of bleaching a little over a decade. The ADA had to make sure that teeth whitening was defined and categorized properly to avoid any confusion.

Other Methods of Whitening

Teeth whitening can happen in one or two ways. You can achieve whitening by bleaching the tooth, which actually changes the overall color of the tooth; or you can use non-bleaching products, which contains certain ingredients that help to remove stains.

Overall in my findings, I have come to the conclusion that bleaching is safe as long as applied correctly and not over-used in one application. Some people may be more sensitive than others to the bleaching agents.