Effect of tooth whitening strips on fatigue resistance and flexural strength of bovine dentin in vitro.

PLoS One · 2017 · PMC5344512 · PMID 28278191

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highly significantno p-value reported

The effect of the application of the whitening strips for these shorter time periods on bovine dentin flexural strength and fatigue resistance was still highly significant.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.