* Teeth whitening is a bleach-based chemical process that can have serious side effects. If your teeth or gums aren't in perfect shape, whitening can cause pain and even damage. Only a thorough dental examination can grant you a clean bill of oral health. When was your last check-up?
* All thumbs when it comes to motor skills? If you're thinking about taking your own impressions for custom-fit mouth trays, know that the resulting mold will only be as good a match as you're able to finesse - and that can have an effect on the final whitening results you achieve. Remember, the goal is maximum bleach-to-tooth contact.
* Do your teeth or gums react intensely to heat or cold? You might be the sensitive type, so if you're planning on do-it-yourself whitening, then do your homework and pick kits with lower peroxide concentrations or peroxides formulated especially for sensitive teeth.
* Confident about your whitening skills? Tray whitening kits come in a wild variety of configurations. You can purchase trays and bleach together or separately, get a complete kit with aftercare products included (toothpaste etc.). But do your homework and make sure you either ask your dentist for or order something you can administer with confidence.
* Use common sense. Teeth whitening is an almost unregulated field - with many foreign & domestic companies offering fraudulent products and kits. Before you put chemicals in your mouth, make sure you can trust the source of those chemicals - and stick with companies and brand names you know.
From : http://www.teethwhiteningreviews.com/artman/publish/all-about-teeth-whitening-trays.php
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