One Month Before Your Wedding: Whiten Teeth Looking to brighten those pearly whites? Get your teeth professionally whitened two to three weeks before your wedding for best results, according to Gloub-Evans. However, if you're planning to do at-home whitening, start five weeks to a month before. Should the at-home results disappoint you, you can still get a pro whitening treatment done a week or two before the big day. "Touchups should be done a week before the wedding, giving the pores in the teeth enough time to close (this takes 48 hours) so the bride can enjoy whatever food or beverage (dark or light) that she wants at her rehearsal dinner and wedding reception," says Gloub-Evans.
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