My family has used camphor(alcohol mix) for canker sores by wetting  cotton 
swab, then
holding against the sore---yow!  Readily works, but ouch!   I remember that 
when I was growing up and drinking lots of the "old" coke,  plus eating 5 cent 
candy, I would grow them
"nasties" quite often!  Pete
P.S. That started about 100yrs ago and still goes on! 
 
My family has
In a message dated 7/29/05 7:15:44 P.M. Pacific Daylight Time,  
[email protected] writes:

I  have had great results with large amounts of lysine
each day - 2 -  3,000 mg for a child. Since I began
drinking generous amounts of CS  each day, no sores.

I've had two reports of canker sores  disappearing with
plenty of CS each day - 6 to 8 oz  day.