There is no canker sore cure. There is some debate in the medical community about aphthous ulcers being attributed to a viral or bacterial infection, but nothing conclusive has been shown yet. Nevertheless, after doing an extensive amount of research and asking a couple of medical professionals about canker sores, I've come up with a list of suggestions you may want to heed if you want to minimize the number of canker sores you get.
Cavities happen when demineralization of a tooth's surface outpaces the natural remineralization process. The acids produced by overly-excited mouth bacteria start to eat away at the protective enamel. Once inside, the bacteria create even more acid, eating an even bigger hole. The bacteria can infect and even kill the living part of our teeth with enough time, requiring a very painful root-canal to repair the tooth. If a cavity is not caught early enough, there isn't much you can do on your own at home. A dentist can remove the bad parts of a tooth, and then fill it in with a hard substance, or cap it with a crown. Unfortunately, if the tooth is too bad off, often the only choice is extraction. Let's try not to let it get to that point, shall we?
Before you go any further, you should know there is no miracle cure for cold sores. If you have already contracted the virus that causes them, then you have joined the ranks of billions of other human beings on this planet with the virus. It is a very common problem; estimates vary from a sixty to ninety percent infection rate. Many people don't even know that they have the virus and carry it their whole lives without an outbreak. Many people (maybe you?) have outbreaks that last a few weeks on a semi-regular basis.