It does not work at all. I let my teeth dry for 2 minutes with a blow-dryer. Applying was very difficult. The brush soaked up most of the product. One wasn't enough to even do a very thin layer on my top teeth let alone top and bottom. Dried for another 2 minutes, then applied the polish and dried it for another minute. Right when I closed my mouth, all the product came off immediately. It's impossible to work with. Don't buy this. Even had sensitive teeth the next morning.