The easiest and least expensive way to make an instant change to ones smile and overall appearance is teeth whitening. There are many options when it comes to teeth whitening. Virtually all teeth whitening systems utilize some form of hydrogen peroxide solution as the active ingredient. There are three different delivery methods available to whiten teeth. There are single use whitening systems that you can buy over the counter or specialized ones that are more effective from your dentist. There are dentist delivered custom tray systems that fit over your teeth to provide the most thorough and complete whitening possible. There are also in office whitening products that are highly concentrated and use fancy light shows to dazzle you. Research has shown that the custom fabricated tray delivery systems offered by dental professionals still offers the best whitening results and can be used for many years such that the return on the investment is the best financial option available too.