One of the main ingredients that belongs to every good tooth whitening gel is peroxide. It acts as a bleaching catalyst and strips stains off the enamel of teeth. The kits you purchase at the drug store are effective and safe to use and are very similar to what dentists use to whiten teeth. Over the counter usually ends up being significantly cheaper route to go because you don't have to pay for the labor and the dentist's overhead since you are doing it yourself.
Other than checking for the active ingredient, you should look at the length of time each tooth whitener takes to get the desired level of whiteness. Some products take longer then other and some are even worn or applied overnight. Heavy coffee and tea drinkers may have to use the product for longer to get their teeth white because those beverages are known to cause staining. Frequent brushing also aids in helping your teeth maintain a whiter look after drinking stain causing agents. Look for a whitening toothpaste or even one with an abrasive agent such as baking soda.
Tooth whiteners cannot change the color of crowns, fillings, bonding, veneers and should not be used with any sort of dental or denture appliance. Any whitening product is only recommended for use on people with healthy gums. You may care to consult your dentist if you have had any major dental work or wear any dental appliances to see if teeth whiteners are safe for you to use or will any undesired side effects.
Source by Hoby Brennan