Tony, neither white strips or pearl drops do anything. In fact, most tooth whitening toothpastes do nothing. The only one I recommend is Opalescence which is only available from dentists. The reason for this is quite simple, all other whitening toothpastes work by being very abrasive, they do a lot of damage to your teeth and encourage more staining when you stop using them.
Opalescence work by breaking down superficial staining, it does not whiten your teeth. No toothpastes whiten teeth. The only way to whiten teeth is to do it professionally. If you have a problem with staining, try the Opalescence, it may give you the results you're looking for
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