Removal of extrinsic stain using a 7.0% sodium hexametaphosphate dentifrice: a randomized clinical trial.

A nine-week, randomized and controlled clinical trial was conducted to compare the stain removal efficacy of a 0.243% sodium fluoride dentifrice containing 7% sodium hexametaphosphate (5% hexametaphosphate anion) to that of a 0.243% sodium fluoride control dentifrice.