How long before crest white strips expire?

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Nothing. After the recommended time, the active ingredient is expended, and the white strip is simply inactive.

Generally speaking it's a good idea to wear the retainers full time for a period after the braces are removed in order to allow the teeth to stabilize in their final position. Once the orthodontist...

I've gone through 2 boxes in the past 8 months. They are very effective and i believe they are safe as well. my dentist says i have really healthy teeth.

Look at the due date.Check for an expiration date, and if there is not one just smell it. It will have a foul smell if it's bad. If there is an expiration date, most products are good a week after...