|Stains on teeth can be classified as extrinsic or intrinsic. Extrinsic stains appear on the surface of your teeth. Intrinsic stains live between the microcracks in your enamel and deep within your dentin (the layer of your tooth underneath your enamel). Whitening toothpastes and mouth rinses may be able to remove some of the extrinsic stains on your teeth. But only teeth whitening agents can remove the stubborn extrinsic stains and the unsightly intrinsic stains that cause your teeth to look discolored. Over the counter whitening system is different than professional whitening as being dentists we can use optimum concentration that is within the health range of the material compared to the over the counter agents where they are restricted. We at White Sand Dental Studio prefer to use Carbamide peroxide Only to have stunning results and keep your teeth in health compared to many dental offices where they use hydrogen peroxide in high concentration that can cause higher sensitivity over the time and can compromise the longevity of tooth.