Get visibly whiter teeth in just 30 minutes a day. Can you spare just 30 minutes a day for just 12 days to reverse years of staining? Of course you can. Crest 3D White Whitestrips Classic Vivid makes it easy to whiten teeth and reveal a brighter smile. Using the same enamel-safe whitening agent as dentists use, your smile will be restored to its former glory in just 12 days.