In vitro whitening studies provide manufacturers with a cost-effective tool for assessing the whitening efficacy of oral care products. The extent of whitening is often measured using a spectrophotometer, and the amount of whitening reported as the total change (Delta E). A problem for marketing departments is that consumers struggle to understand this term and to link changes in delta E to colour changes that are relatable to the human eye.
In this case study, from our expert Gavin Thomas, we describe our solution to this problem which involves converting changes in delta E into changes in tooth shade, a parameter that most consumers can understand and perceive.

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