If I used a box of Crest Whitestrips a year ago, would they still work if I did them again immediately?
Answer:
As with anything a year outdated it may be less efficient, but whitening strips would be fine to try even if they are old. Check the box and see if at hand is an expiration date, and if you have any question they usually supply a toll-free phone # or a website with FAQ
They might remove the colour your teeth more. I usually tell my patients those over the counter bleaching systems may require more than one box initially. Go for it.
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