I am giving this a nine solely based on the relief it provides for those nasty canker sores. The medicine burns and it is a pain to put on, but it you regularly suffer from canker sores, then this is well worth it! It covers up the sore and makes it easier to eat and drink and I am sure makes it easier to heal. But, be aware that it will burn as it is going on and for it to do the best job, the surface of the inside of the mouth needs to be dry where you want to apply this. That can be a challenge, but well worth the time and effort if you want to actually eat food during a breakout! If you are going to apply this on a child, you will definitely need to be helping them a lot with the application. You might even need help yourself. It helps to put on a thin coat and to blow on it as it dries to help the process go more quickly. I always keep some of this around and am thankful someone thought of something like this to help!