Steve Granitz/WireImage; Courtesy of Target
Don’t let a scary, yellowish post-facto picture be the reason you start whitening your teeth. Two weeks before your big event, start a dental brightening regimen like the Crest Whitestrips Advanced Seal ($45 for 14 doses, available nationwide). The new strips mold to your teeth with stronger adhesive, which means more powerful, concentrated whitening. After a few days of 30-minute sessions you’ll start seeing results, but trust us, for a smile as dazzling as Zoe Saldana's, the full two weeks is well worth the wait.