I have suffered from canker sores since I was a little girl and they can cause so much pain that I am unable to speak or eat. I have tried so many pain relief products that have not worked so out of desperation I purchased the OraHealth CankerMelts one day. I immediately threw one in my mouth and spit it out because it was not what I expected. It did not melt quickly and tasted quite odd. I decided to read the instructions and applied as directed to the canker sore and it did finally dissolve. I had almost given up on the third day but I woke up that morning and could instantly notice a reduction in the pain and irritation. I continued to use until it was gone and this was the first product that had reduced the healing time. I did not experience any kind of negative side effects while using this product. I was very impressed with it and continue to buy it for my canker sore pains. I would recommend this product. It is great at helping me heal the sores faster.