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Mouth sores – What can you do yourself?

Created: ; Next update: 2022.

Mouth sores can have various causes – and are treated accordingly: For example, if the cause is a fungal infection, then antimycotics (antifungal drugs) are a suitable treatment. There are also other things you can do yourself to relieve the symptoms.

There are many different kinds of mouth sores, including canker sores, infections and pressure ulcers due to dentures. They are caused by various things. One common cause is cancer treatment: It can attack the mucous membranes or weaken the immune system so much that germs spread and lead to inflammations.

There aren’t always special medications that can eliminate the causes of the inflammations. Then you can use creams or gels from the pharmacy that relieve or slightly numb the pain. If you would prefer not to use medication, you can try to protect the lining of your mouth when you eat and drink.

What foods and drinks should I avoid?

To keep from irritating inflamed parts of your mouth even more, and to prevent them from getting worse or new sores from forming, it’s better to avoid the following foods and drinks until the wounds have healed:

  • Alcoholic drinks
  • Carbonated ("fizzy") drinks
  • Hot foods and drinks
  • Very spicy foods
  • Acidic foods like tomatoes or citrus fruits
  • Hard and sharp-edged foods like bread rolls, raw vegetables or potato chips (crisps)

What should I consider when preparing meals?

When you chew, the mucous membranes lining your mouth move. This stretches the sore areas, which can hurt. Eating soups or soft food can help to prevent this pain.

During cancer treatment, people may have inflammations in their mouth as well as nausea, loss of appetite or loss of taste. As a result, they may eat less and lose too much weight. Adding things like butter or cream to soups and puréed food may help. This keeps the meals easy to eat and ensures that you have more calories even when you eat smaller portions. The higher fat content also enhances the taste of the food, making it easier to avoid using a lot of spices.

It’s also important to let cooked food cool down enough before you eat – or to simply eat cool meals. There are various dishes that taste good despite being cold – like savory soups made with buttermilk, or sweet foods like custard, mild quark cheese, yogurts or shakes. If you like it sweeter, you could add honey instead of sugar or eat a spoonful of pure honey every now and then. Some studies have shown that honey helps to relieve the pain caused by inflammations of the membranes lining the mouth in people who have cancer.

Keep up oral hygiene

Thorough oral and dental hygiene is important – not only to prevent inflammations in the mouth, but also when mouth sores have already developed. This means:

  • Brushing your teeth after meals and before going to bed with a soft brush.
  • Rinsing your toothbrush carefully after brushing, letting it dry and replacing it regularly (every month).
  • Cleaning dentures and wearing them less for as long as the inflammation lasts.
  • Cleaning the spaces between your teeth as you usually do, for instance with special interdental brushes (but if that's not part of your normal routine, you shouldn't start when you have an acute inflammation).
  • Using non-alcoholic mouthwashes.

What else is important?

It’s also important to drink enough fluids, not smoke and regularly check the lining of your mouth in the mirror. If the pain gets worse, or if the mucous membranes swell, change color or bleed heavily, it's a good idea to see a doctor or dentist.


© IQWiG (Institute for Quality and Efficiency in Health Care)
Bookshelf ID: NBK546249


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