Very simple. I have sensitive gums so the gums turned a bit white (maybe I used too much gel and brushed my gums first) and I had to wait to start again but I definitely noticed a little difference in my teeth. after first use. A few more tries and my teeth should be white as the stars lol. I also love the attached spreadsheet so I can track my progress! I just put this on and watch my favorite show on TV until the process is complete!
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