Wen Luo

TL;DR: Psychophysical studies on tooth colour and whiteness via third party assessment of images indicate that whitened teeth lead to judgements that are more positive on personality traits such as social competence and appeal, intellectual ability and relationship satisfaction.

TL;DR: The WIO index is appropriate for assessing changes in tooth whiteness and the digital imaging system is reproducible and reliable in evaluating changes in whiteness of teeth.

TL;DR: A new whiteness formula (WIO) was developed by optimising the original CIE whiteness formulas and it was found that WIO gave the best performance for predicting tooth whiteness based on the laboratory results.

TL;DR: The findings demonstrate that for a whitening treatment with a blue covarine optical technology, a colour change of about 2 WIO units would be noticeable.

TL;DR: In the present study statistically significant tooth whitening was evident after 3 days treatment with the tray based whitening system and colour improved with continued usage over 14 days, which supports the previous study results that the WIO index is appropriate for assessing changes in tooth whiteness.