These strips work once a month with minimal gum discomfort. However, there is a problem. I ordered and used this product for the first time in June 2018. The last treatment should therefore take place in May 2019. I just checked the "best use" date: December 2018, so if the strips wear off by then I've actually paid double for half a pack. Maybe it's better to buy things with an expiration date the old-fashioned way - at a store where you can check the expiration date.
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