The package instructions says to use "twice a day for 7 days to whiten your teeth." I only used once a day and my teeth are several shades whiter and brighter! It's very easy to use and not time consuming. When I first got the pen I had to twist over one hundred clicks to get the gel to come out. The whitening strips would make my teeth super sensitive so I wasn't able to whiten my teeth until...read more now. This pen does not burn or hurt teeth or gums or make them sensitive. The pen is portable and you can do this anytime anywhere. You don't need to be home and it's not messy. This is so convenient and it really works! In just 7 days!
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