I used them... I use the crest ones for 5 minutes a day. You're supposed to use them every day...
I was decent about it, and probably used them for about a month, only missing a few days here and there...
That was about 6 months ago, I really noticed a difference! I should probably use them again. Ill start today.
I would like to try the ones where you use them for 30 minutes a day for a week. I don't know if I could handle it in for 30 minutes though...
Oh and I don't have the straightest teeth, and didn't find any problems with them holding.
For comfort reasons, I only use one at a time though (top, and tbottom seperatly)
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