I bought some Kanka brand topical pain relief stuff today. I have to say, this stuff is amazing. This is the worst canker sore I've had yet, which is what prompted me to ask LJ and DW and Tumblr what was going on (Tumblr never responded, so thanks LJ and DW!) and what to do about it. First time I put some in, it made my entire tongue go numb, which made me feel the emotional equivalent of a cat wearing booties she can't get off and can't walk right in. But the second time, just now, I was a lot more cautious, and this time it worked without any numb tongue. Though it's not working quite as well. But well enough.