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Difeng sephora teeth whitening system We receive important feedback on how our existing customers' experience Difeng brand by conducting customer surveys through regular evaluation. The survey aims to give us information on how customers value the performance of our brand. The survey is distributed biannually, and the result is compared with earlier results to identify positive or negative trends of the brand.fluoride mouthwash safe,best mouthwash for enamel,12 hour mouthwash.