In the past I have used gel squeezed into a tray. These pens are so much easier since you can control where the gel is and how much is on each tooth. I put the gel on and used my tray leaving it on only as long as I was in the shower which is less than the recommended 20 min. I have used it twice a couple days apart but can see marked whitening even in such a short time. I really like the ease of use, I am not sure how I would like them without the tray.
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