How long do u have to wear crest whitening strip on ur teeth?!
Question: is it like 7 hours at night?
or 1 in the day?
Answers: is it like 7 hours at night?
or 1 in the day?
I believe you only wear them for like 20-30 min. Check with the back of the box, it should tell you exactly how long to wear them. Also, if you dont have the box, check out their website. They might have the info there or a customer service number you can call. =)