I have a really bad canker sore because of high stress. what foods should i avoid?

Canker sore: Avoid anything spicy or acidic. Stay on a bland diet. Get orabase ointment (non-prescription) and apply it to the canker sore before meals. Orabase ointment works like an oral bandage and sticks to the sore, to protect the sore from contact with food and drink.

Canker sore: Avoid exceptionally hot (temperature) foods, foods that are other than bland, and acidic foods. Your dentist may suggest OTC products to reduce sensitivity. Laser treatment may be helpful. Call your Dentist.