I have been getting these very painful sores, usually on the tip of my tongue, that I can barely see, except for a tiny hole the size of a pin in the center. Peroxide doesn't help much and eating makes it worse. It is almost unbearable. I have been very busy lately and haven't been able to ask my dentist, but I'm afraid he will just shrug anyway. These sores are recurring and I usually have one coming or going.