I have found that breaking the sores (with fingernail clippers) to open them and applying Head & Shoulders shampoo is an incredible way to get rid of cold sores fast. You must open the sores, though, to get the shampoo directly inside them. Warning, it hurts like peroxide on cuts but it's worth it. If you do this at the first tingle, you can usually keep the sores from developing at all. Apply it often. Then, once the sores are scabs, use polysporin to heal them very quickly.