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Demand for whiter teeth has grown dramatically in the past decade. A multitude of oral care products on the market today claim to provide a whitening benefit. Extrinsic stains, those forming on the surface of the tooth, are caused by factors such as diet, poor hygiene, and smoking. Dentifrice formulations with whitening agents provide an efficient way to help remove and prevent extrinsic stains. Common ingredients include those that work by physical stain removal (e.g., silica) and those that work by chemical stain control (e.g., sodium hexametaphosphate).
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