Review (3/5): A bit loose and difficult to use
I am using this in conjunction with teeth whitening gel. Since the whitening gel makes your teeth more porous and soft, it's generally a good idea to use fluoride rinses and demineralization products to "harden" your teeth and restrengthen your enamel. I do believe it is helping to harden my teeth, as I'm getting slightly less tooth sensitivity with my teeth bleaching sessions. However, it is very loose and difficult to use in teeth trays. Next time I'm going to look for a gel that has a thicker texture so it stays put better.