Mouth ulcers, commonly referred to as canker sores, are common, non-contagious lesions that appear on different parts of the mouth and gums. These sores are often painful and can be exacerbated by eating or drinking certain foods, including foods that contain citric acid or are otherwise acidic.
Canker Sores
Mouth ulcers often appear as small, yellowish or white-colored spots on the inside of the mouth and on the gums, as well as occasionally on the under side of the tongue. There are two main types of canker sores: minor and major. Minor sores are less than 1/2 inch in diameter and have an oval shape, while major sores are larger and have irregularly shaped edges, according to MayoClinic.com. There are also herpetiform canker sores, which are typically very small and appear in clusters of between 10 and 100.
Causes
It isn't exactly clear what causes mouth ulcers, or causes some people to develop them while other people do not. According to MayoClinic.com, possible causes include mouth injuries, food allergies, eating a diet that lacks vitamin B-12, zinc, folic acid and iron, as well as food sensitivities. In particular, people who are sensitive to chocolate, coffee, strawberries and foods high in acid, including citric acid, such as pineapple, may develop mouth ulcers as a result of eating these foods.
Treatments
Minor canker sores and mouth ulcers don't usually require treatment unless they are so painful that they limit your ability to operate. There are a number of oral rinses and topical ointments available over-the-counter, but people suffering from such ulcers should also avoid acidic foods as these may cause more pain. Further, abrasive or spicy food may also cause more discomfort, as can brushing your teeth with a brush that is too firm.
Other Considerations
A wide range of foods contain citric acid naturally, such as citrus fruits. In other foods, citric acid is added as a preservative. If you're sensitive to citric acid, always read the product labels before selecting a food item, as citric acid will be listed as an ingredient if it is present. Talk to a doctor or health care provider if your sores do not go away or are causing you significant pain.
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