I've tried a bunch of expensive whitening products, this one for the whole set is about $25 you get SO much whitening gel! This works so well to whiten, whitening strips make my teeth extremely sensitive with just one use. I can use this stuff every day twice a day and my teeth never hurt. This is really a great buy! Wish I gave into all the hype sooner! It doesn't make you drool unless you put too much gel in the trays. It says right on the directions that if you use too much it reacts with your saliva and will cause drooling.