How painful is a canker sore? How to get rid of it as fast as possible?

Depends on location in the mouth

Painful and extremely annoying. Orajel is an over the counter medication you can find at any place that sells medications. Like $5. It works ok

It's very painful. :( Anbesol works for me.

I get them all the time. Put some baking soda on it.

Hmmm there is an ointment you can purchase at local pharmacy that will deaden and help,it heal ..