I have an aphthous ulcer (canker sore), is there any food I should stay away from? Anything that might cause more?

Acidic food/drinks. You should avoid acidic foods such as soda and other carbonated beverages, citrus fruit, etc. Rinse 4 times a day with warm salt water rinse to ease the pain and aid healing. The cause of aphthous ulcers is not really known exactly, but you should avoid acidic foods or anything that irritates the mouth. It takes 7-10 days for it to heal.
Aphthous ulcers. Acidic foods like tomatoes, orange juice, lemon juice, lime juice, high-dose vitamin c seem to be linked with canker sores in many people. Limiting consumption of these may help prevent recurrence. Others triggered by oral injuries: jagged tooth, biting inside of mouth, overly vigorous tooth brushing, braces, dentures.
Acidic foods/drinks. The reaction of people to acidic foods is very variable. Some people are just more susceptible to reactions to acidic foods and drinks, like orange juice, pineapple juice, fruits, tomatoes, and others. Stress and anxiety also create problems sometimes. As far as i know, prevention is difficult except for keeping track of what you eat and when you get the sores.

Related Questions

Their any way to permanently heal "aphthous ulcer" (canker sore)? Is there something wrong inside my body?

Aphthous ulcers. Aphthous stomatitis involving the common canker sore can occur in up to 15% of americans, and may involve some bacteria like staph epidermidis. However, similar-appearing aphthous ulcers can be seen with herpes, crohn's disease, and other systemic disorders, if you have multiple aphthous ulcers or frequently recurring ones please have the lesions checked out. Read more...
No Prevention known. Researchers are not sure of the cause of aphthous ulcers. There is no known preventive measure. Treatment is palliative with low level laser therapy able to relieve pain and accelerate healing with about 5 minutes of trea. Dment. Biolase waterlase iplus or md works well in my practice, of the lasers I have tried. Read more...

Any magic, special treatments for "aphthous ulcer" (canker sore)?

Depends on cause. Aphthous stomatitis involving the common canker sore can occur in up to 15% of americans, and may involve some bacteria like staph epidermidis. However, similar-appearing aphthous ulcers can be seen with herpes, crohn's disease, and other systemic disorders, if you have multiple aphthous ulcers or frequently recurring ones please have the lesions checked out. Read more...
No Magic Cure. Researchers are not sure of the cause of aphthous ulcers. There is no known preventive measure. Treatment is palliative with low level laser therapy able to relieve pain and accelerate healing with about 5 minutes of treatment. Biolase waterlase iplus or md works well in my practice, of the lasers I have tried. Read more...
Ointments. There are several prescription ointments for canker sores that sooth and heal. There is also an ointment called kenalog (triamcinolone) in orabase that acts like an oral bandage to soothe and protect. You should consult your dentist. Read more...