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Glycerin is a highly allergenic base ingredient that is commonly found in whitening gel. It is not a great choice of base ingredient for consumers because
it creates unnecessary irritation, has a terrible taste that lingers on in your mouth for hours and can cause extreme allergic reactions in many people. The reason it is commonly used in dental whitening formulas is because it
is cheap for manufacturers to produce and it requires little quality control. Manufacturers using glycerin do not need to pay attention to the actual amount of peroxides included in their formulas because glycerin will
mask any errors in the manufacturing process. Glycerin is great for manufacturers, but terrible for consumers.
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