Tooth whitening, also called tooth bleaching, is the process of lightening the colour of human teeth. Whitening is often sought when teeth become yellowed over time, and it can be achieved by changing either the intrinsic or the extrinsic colour of the tooth enamel.
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1. Wikipedia
Wikipedia contributors, Wikimedia Foundationhttps://en.wikipedia.org/wiki/Tooth_whitening, lead sectionQuote, https://en.wikipedia.org/wiki/Tooth_whitening, lead section
Tooth whitening or tooth bleaching is the process of lightening the colour of human teeth.
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