Canker sore are commonly triggered by hormonal changes. But factors such as stress, menstruation,pregnancies, food allergies, weight loss, illness, accidental biting and vitamin B12 , folic acid and iron deficiency can stimulate also the condition.
There is no cure for canker sore but just go away in a week or two. Although it goes away it can still be prevented and treated. Proper dental hygiene including brushing and flossing prevents bacteria build up in the mouth and can further worsen the infection. There are medications available to speed up the healing of canker sore, they are usually easy to use .
Rinsing with alum, milk of magnesia and chicona bark is one alternative rinse in preventing canker sores. And licorice root can be an effective herbal remedy also for it is an anti-inflammatory and tissue healer.
But for severe cases of canker sore it still necessary to seek professional advice from your dentist.