I am astounded that this product is reviewed so highly. It's a runny, goopy mess. I tried to apply it into the tray and it just runs out like water. If, as I've read in other reviews, it's a bad batch why are they still on the shelves and why doesn't the manufacturer complete a quality control check before shipping the product.
What I did manage to use made absolutely no difference to the whiteness of my teeth. In my opinion run don't walk to better known brands that have some sort of standards that they aspire to before shipping products out to consumers. I do not recommend this product.