pretty good, room for improvement
I bought this and carefully read the packet and reviews/suggestions from everyone.  Before I put them on I use a toothbrush (that I've specially designated for this) to gently scrub my teeth, then carefully put them on.  Immediately I start drooling so much, that I keep a bath towel under my face to collect everything!  Yes, it sounds gross and it is gross.  But I don't want to swallow any of that nasty taste or lose a precious whitening strip!  These things make me drool like crazy and for 30 minutes I maintain the biggest smile possible with a folded over bottom lip - to keep the lower strip in place.  Every few minutes I check with my fingernail to make sure the bottom strip is still against my teeth.  I have had no problems with tooth sensitivity (but I don't eat a lot of cold foods), burns, or anything else.  They do seem to be working.  I've been doing them at night, I'll do 2 or 3 in one sitting (the manual says that's as effective).  Then I'll stop for a few days.  As some other people have suggested, I will probably finish this package and then continue to do it maybe once a week.  I read somewhere that to appear natural, your teeth should be no whiter than the white in your eyes.<br /><br />This product gets 4 stars because of all the gross drooling, I can't imagine using this product anywhere other than behind a closed and locked and mirror-less room.  The drooling causes the bottom strip to move around too much.  Maybe this should come with a tray to cover the strips to keep them dryer.
Rating: 4 stars