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Custom-made whitening trays are designed to fit the contours of your teeth. The usual daytime system uses whitening gel worn for 30 minutes a day for 10 days. For older people and those with darker teeth, a night-time slow-release gel is usually recommended for two weeks at home overnight. A Colgate Optic White Pro Light system is also available for extra-sensitive teeth, using a serum for 10 minutes a day.