Thank Goodness I found this page. I started with two small canker sores a week after my flu shot. I hardly ever have a canker. So, I used Ambesol Max Strength. It burned, numbed, but things got much worse today. Almost two inch long canker on the side edge of my tongue. And three more scattered on my inner front and side lips. I rinsed with the pure apple cidar vineger. It didn't releave the pain. So I tried the baking soda paste. The paste started to tone down the pain. I was at a 10 most of the day. After the baking soda treatment, I am currently down to a 4. maybe less.ahhhhhh
