What causes canker sores? how do i prevent them?

Canker Sores: Possible triggers for canker sores include: a minor injury to your mouth from dental work, overzealous brushing, sports mishaps, spicy or acidic foods, or an accidental cheek bite, toothpastes and mouth rinses containing sodium lauryl sulfate, food sensitivities, particularly to chocolate, coffee, strawberries, eggs, nuts, cheese and highly acidic foods, such as pineapple, and others.

Not very well known: The exact cause of canker sores is unknown. Stress or tissue injury is thought to be the main cause of simple canker sores. Certain foods can also cause these sores. Sometimes a sharp tooth surface or dental appliance, such as braces or ill-fitting dentures, can also trigger canker sores.Some cases of complex canker sores are caused by an underlying health condition, such as an impaired immune sys.