Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Home Remedy for Canker Sores

I believe this also works for fever blisters. (I haven't read this book, but want to tell fellow sufferers about this.) Go out and buy at least 4 toothbrushes. When you have a canker sore, be sure to brush your teeth at least 4 times a day, each time with a different toothbrush. Don't use that toothbrush again for at least 24 hours -- maybe 48 hours in a wet climate. Brush all the rest of your mouth and gums and tongue and teeth first, then end with a gentle brush across the sore. I used to get a canker sore which would blossom into two more at the same time, with the peak of pain coming about 5 days into it. This technique usually means just one sore that goes away within a few days. Try it and pass it on.