These are ulcers or sores that typically affect the gums, tongue or the insides of the cheeks. They may occur singly or in groups; they may be a one-off condition or they may recur. Mouth ulcers appear like a shallow crater with a white or yellowish interior, surrounded by a halo of red, inflamed tissue.

Often, they occur as a result of trauma €“ a knock to the mouth when brushing the teeth, for example, or a bite on the inside of the cheek while eating. Mouth ulcers are not caused by an infection, so are not contagious. They cannot be caught by kissing or by sharing drinks, etc. The main symptom of mouth ulcers is discomfort or pain, especially when eating, drinking or even talking. In severe attacks, the sufferer may feel feverish, run down or under the weather. Pain may be a factor for seven to 10 days, with the ulcer healing completely in one to three weeks.

For reasons that are unknown, some people seem particularly prone to this condition. A number of factors may be linked to recurrent mouth ulcers, including poor diet, stress, hormonal changes, sensitivity to certain foods, and smoking. OTC products can help to relieve the discomfort of mouth ulcers. As with teething products, these tend to be based around local anaesthetic ingredients (e.g. Orajel Mouth Gel, Anbesol, Bonjela, Iglü).