I have read that Pearl Drops work by removing the stained tooth enamel on the outside of the teeth revealing the inside enamel which is not stained and thus whiter. However I have also read that it is abrasive which is bad for your teeth because it is rough your teeth won't be smooth therefore it will be easier to stain possibly making your teeth more stained in the future. I would stay away from it until I know for sure, and I'd ask a dentist because they know the most about teeth.