This doesn't last long. After 10 minutes, it's completely dissolved in your saliva. My daughter has braces and wanted to try something to help with the pain. (We purchased a different version of this: I believe it was the severe pain gel) It didn't last very long and it rubbed off on the inside of her cheeks. However, for those 10 minutes, she felt no pain at all. You're not supposed to apply this more than 4 times a day though. She likes the way it feels and cools the area while numbing.