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Whitening may refer to:

• Key whitening, a technique intended to increase the security of an iterated block cipher
• Racial whitening, a theory of racial profiling
• Skin whitening, a cosmetic procedure used to whiten the skin
• Tooth whitening, a common procedure in general dentistry
• Whitening (leather processing), the process of lightening the colour of leather
• Whitening transformation, a decorrelation method that converts a covariance matrix of a set of samples into an identity matrix.

Whitener may also refer to:

• Coffee whitener, a non-dairy additive product for hot drinks
• Optical brightener, a fluorescent ingredient in products such as laundry detergents
• Basil Lee Whitener, a Democratic U.S. Representative from North Carolina between 1957 and 1968.

• Disambiguation pages