Canker Sores - I grew up with painful canker sores until I stopped doing this ...
When I was younger I used to have giant flare ups of painful canker sores - I couldn't eat because the pain was so extreme. A dentist never told me the secret to ending them for good - It's been years since I had one.
Stop all toothpaste except Sensodyne or Biotene - never, under any circumstance use a regular toothpaste again . NO mouthwash of any kind!
No chewing gum of any kind or breath mints - Even one piece of gum can cause a flare up.
Pineapple strips the lining in your mouth and may cause canker sores for some people
Some people have the same reaction from nuts so take note if you get a flare up within a week of eating nuts.
If you follow these rules your life will change forever - the painful sores will be gone.
If you get a flare up - do not use mouth wash - you can rinse with 1/2 tsp. salt in 1 cup warm water but that is all you can do. For extreme pain you can ask about medical grade Lidocaine 2% but only use a dab on a q-tip as this will freeze your entire mouth including yor throat if you use too much.
I hope this helps someone out there who suffers greatly from canker sores.