I applied this over a month and a half ago and it is still going strong! This works really well. Though, don’t go by the instructions. Use 3 drops to the 1 scoop. And you don’t need to separate it and do all that, just add the drops, mix it and apply it right away. It hardens pretty quickly, so get it on there asap. I would also recommend getting some dental tools, you can get them for like $10 on Amazon. Just get a cheap kit, that has like the mirror and picks and the other stuff. I use one that has flat ends on each side (flat but tapered at the tips), there are a couple others I use sometimes but that’s the main one. The color is a great match, but over time may yellow up a bit if you are a coffee/soda drinker and/or a smoker. But if you brush your teeth with baking soda it will fix that right up. Hope this helps! ?