My sister had this product at her house and I had never seen the dissolvable whitening strips before. They are so much easier to stick properly to your teeth rather then than forming a wet/gooey piece of plastic to fit it perfectly without ruining the strip. The dissolvable strip sticks right on your teeth and doesn't slide off! The plastic strips slide right off your teeth and is a waste of time and money putting on because you won't get the gooey whitening serum on your teeth. Another issue with the other strips is that they gooey serum tastes HORRIBLE! With the dissolvable strips, it had a much more pleasant taste and it didn't make my teeth feel a uncomfortable tingly sensation. When I used the old product, it made my teeth feel like it was losing the strength and enamel on my teeth. There was much discomfort, even when the strips weren't in my mouth. With the listerene dissolvable strips, I never had this issue ( I ended up buying a pack for myself. ) My only con I would say about this item would be that the strips would leave access film on my teeth and clumps up. I would be wiping my teeth off with a napkin a lot to get the film out of the creases in each tooth.