yogurt has a dynamic acidophilus culture in it that can counteract and cure the sores. It is constantly prudent to see a specialist if your canker sores does not go even after over 14 days, or on the off chance that you have this sort of sore once or all the more like clockwork...
however, probably abbreviating the story somewhat, and you will probably abbreviate it yourself when you pass it on. In this situation, the story happened to a friend of one of your friend's friends, but to simplify things, you'll probably just say ...