Joe
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        I have had many canker sores but my   canker sores are from using asthma -  inhailors and differt asthma medication.    What I was told and practice is washing  your mouth out with salt water twice to  three times a day and see if that helps  them, with me the practice I just told   you about did wonders for me.