I just wanted to add my canker sore experience.
I have had them for as long as I can remember. Maybe age 10? My Dad had them and he must have passed them to me. They are so painful. About 12 years ago I was at work with 2 whoppers and a coworker recommended Lysine. She said she took it for a prolonged period and her sores never returned. So I tried it. That was 12 years ago, and I haven't had one since. I took a large dose for about a month and then maintenance, probably @500mg every other day, for a few months. Poof, gone. Multiple sores every year for 15 years, and then after Lysine they never returned.
My DD (8) has had 4 in the past few weeks. She is finally losing teeth and I think the action going on in her mouth must have aggravated something. About 3 weeks into the outbreak (I wasn't paying attention, oops) I dosed her up on Lysine, and she is now taking 500mg every other day. The Lysine stopped the sores in their tracks and they healed very quickly. I am hoping that they will go away for her as well.
Just passing my experience on to other mamas. I haven't posted on MDC for probably 3 years... I hope this info is helpful to some.