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The Oral-B Rembrandt Whitening pen offers easy, targeted application. Company executives said whiter results can be seen in just 14 days of regular use. Clinically proven for safety, the unique all-in-one design enables one-step whitening. Consumers apply the active ingredient via a soft, flexible tip. The no-clump formula ensures the formula stays on teeth overnight. The portable pen retails for $14.99.