If I used a box of Crest Whitestrips a year ago, would they still work if I did !
Question:
If I used a box of Crest Whitestrips a year ago, would they still work if I did them again now?
I want to know if it would be counter-productive to use them again
Answers:
As with anything a year old it may be less effective, but whitening strips would be fine to try even if they are old. Check the box and see if there is an expiration date, and if you have any questions they usually supply a toll-free phone # or a website with FAQ