However, you need to be concerned about one factor far important than just the price tag for any one of the alternatives. This is the ingredients themselves.

The common main ingredient in all approaches is peroxide. Teeth whitening is achieved by the peroxide letting oxygen into the enamel and it then bleaches the colored substances. This is how it all works. But, some approaches use alcohol and glycerin. The reason for the alcohol is to dry the brushed on gel so it stays on teeth. With all of the saliva and movement that goes on in your mouth, it does not stay put anyway. The alcohol can actually cause bad breath and is bad for your gums. Then you have the glycerin based products. Glycerin is harmless on it own. But mixed with the peroxide it actually dries out the tooth enamel and literary causes the sensitivity that so many have with teeth whitening.

Whether you choose a professional or do it yourself method, look at more than just the cost of the desired results.
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