We're hesitant to say much with just the information that your foil package states "Crest Whitestrips Advanced Seal."

The "advanced seal" term simply refers to the way the strips adhere to your teeth, and has no bearing on how long you wear them (but this property would be more likely to be associated with strips worn for longer a duration, either worn 30 or 60 minutes).

"Crest Whitestrips" is obviously their brand name. In years past when that term was used alone it typically referred to their basic/introductory product, which was worn for 30 minutes. But we don't know if your packaging contains other descriptors that would indicate a different product.

The safest bet would be to contact Crest.

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