Okay the sores that you may be referring to are called apthous ulcers. They are easily confused with canker sores. But the treatment is essentially the same:
avoid citrus, salts and anything that is remotely spicy.
You may be able to obtain an oral rinse from your physician with lidocaine in it to help but over the counter Orajel will give you the same symptomatic releif without numbing your entire mouth. Use as directed. You can even try Ora-base. Similar to Orajel but this leaaves a clear coating on the area to help prevent irritaion.
Whichever you choose to use be cautious and mind the foods to avoid.
Best of luck to you
Only you can change your life. No one can do it for you.
Dx w/CD 12 years ago. Syptoms for two years prior. No meds until 2007 when I was hospitalized with a severe flare-up. Found a wonderful GI and since have been placed on: Pentasa 4grms per day, Entocort prn, Cipro/Flagyl combo prn, tried Imuran but scared to go back.