I tried them and they really do work... was worth the money
besides if u look on amazon and other places it says
Money-Back Guarantee:
Use all of the upper strips first. If your teeth are not noticeably whiter, return all the lower strips for a full refund. See Package Insert for full details.
After doing the upper teeth I didn't return them because it was noticeably whiter
I have custom trays from my dentist, that cost a fortune, that I use with gel. It works like magic and it is not hard on your teeth like some whiteners are.
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